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中国科学院昆明植物研究所知识管理系统
Knowledge Management System of Kunming Institute of Botany,CAS
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6 could use lots of photosynthates, but contributed little to the accumulation of biomass. 4. Photosynthetic rate of P. armeniacum decreased a little at the noon, and the highest photosynthetic rate was observed at 10:00h in the greenhouse. The variation of photosynthetic rate was in the same trend as stomatal conductance. Higher relative humidity seemed to be the key for higher photosynthetic rate in P. armeniacum. 5. The photosynthetic capacity of C. flavum was statistically larger than that of P. armeniacum. The lower leaf photosynthetic capacity of P. armeniacum was related to its lower leaf nitrogen concentration,leaf phosphorus concentration and enzyme activities. Meanwhile, the extremely lower stomatal conductance and internal mesophyll conductance might greatly limit the photosynthetic capacity of P. armeniacum. The lower stomatal conductance and photosynthetic rate of Paphiopedilum might partially caused by the lack of chloroplasts in the guard cell of Paphiopedilum. Compared with C. flavum, P. armeniacum was more fond of shade environment.6. The short longevity leaf of Cypripedium had bigger photosynthetic capacity and greater potential for fast growth. But the longer LL of Paphiopedilum enhanced nutrient conservation which could compensate its lower photosynthetic capacity. The short longevity leaf of Cypripedium usually had higher photosynthetic rate per unit leaf mass and dark respiration rate, and photosynthetic capacity decreased fast with leaf age. However, for Paphiopedilum, the situation was the opposite. 7. Compared with Cypripedium, Paphiopedilum had higher water use efficiency and lower photosynthetic nitrogen use efficiency. 8. The leaf of Paphiopedilum had higher leaf construction cost and longer repayment time than that of Cypripedium. The leaf structures and physiological functions of Paphiopedilum and Cypripedium reflected the adaptation to their habitats. The leaf morphological and physiological evolution of Paphiopedilum was related to water and resource-conserving traits in the karst habitat. The leaf traits of Cypripedium were the adaptation to the environment rich in water and nutrients but easy to change with seasons.Our results provided evidence of divergent evolution of congeneric orchids under natural selection.","jscount":"1","jsurl":"/simple-search?field1=all&field=dc.citation.source_filter&advanced=false&query1=Mediterranean%2BCrops&&fq=dc.project.title_filter%3APaphiopedilum%5C+and%5C+Cypripedium%5C+are%5C+close%5C+relatives%5C+belonging%5C+to%5C+the%5C+subfamily%5C+Cypripedioideae.%5C+However%2C%5C+they%5C+undergo%5C+considerable%5C+divergence%5C+in%5C+the%5C+aspects%5C+of%5C+life%5C+forms%2C%5C+leaf%5C+traits%5C+and%5C+habitats.%5C+In%5C+present%5C+study%2C%5C+leaf%5C+morphologies%5C+and%5C+anatomical%5C+structures%2C%5C+leaf%5C+lifespans%2C%5C+leaf%5C+mass%5C+per%5C+area%2C%5C+photosynthetic%5C+capacities%2C%5C+nutrient%5C+use%5C+efficiencies%2C%5C+leaf%5C+construction%5C+costs%2C%5C+and%5C+maintenance%5C+costs%5C+were%5C+investigated%5C+to%5C+understand%5C+the%5C+relationship%5C+between%5C+leaf%5C+traits%5C+and%5C+ecophysiological%5C+adaptability%5C+of%5C+the%5C+two%5C+types%5C+of%5C+plants%5C+and%5C+explore%5C+the%5C+related%5C+ecological%5C+and%5C+evolutionary%5C+significances.%5C+The%5C+results%5C+suggest%5C+that%5C%3A1.%5C+Compared%5C+with%5C+Cypripedium%2C%5C+Paphiopedilum%5C+was%5C+characterized%5C+by%5C+drought%5C+tolerance%5C+from%5C+its%5C+leaf%5C+anatomical%5C+structure%5C+including%5C+fleshy%5C+leaf%2C%5C+thicker%5C+surface%5C+cuticle%2C%5C+huge%5C+abaxial%5C+epidermis%5C+cells%2C%5C+differentiation%5C+of%5C+palisade%5C+and%5C+spongy%5C+mesophyll%5C+layers%2C%5C+the%5C+prominent%5C+of%5C+mucilaginous%5C+substances%2C%5C+supportable%5C+leaf%5C+main%5C+vein%2C%5C+lower%5C+total%5C+stoma%5C+area%5C+%5C%28%25%5C%29%2C%5C+sunken%5C+stomata%5C+and%5C+special%5C+stoma%5C+structure.%5C+Leaf%5C+morphologies%5C+and%5C+structures%5C+of%5C+Cypripedium%5C+were%5C+to%5C+the%5C+contrary%5C+of%5C+Paphiopedilum.%5C+Leaf%5C+morphologies%5C+and%5C+structures%5C+embodied%5C+the%5C+adaptation%5C+to%5C+the%5C+environment%5C+in%5C+both%5C+Paphiopedilum%5C+and%5C+Cypripedium.%5C+Our%5C+results%5C+also%5C+confirmed%5C+the%5C+previous%5C+observation%5C+that%5C+Paphiopedilum%5C+was%5C+the%5C+only%5C+genus%5C+that%5C+did%5C+not%5C+possess%5C+guard%5C+cell%5C+chloroplasts.2.%5C+The%5C+photosynthetic%5C+capacities%5C+of%5C+P.%5C+armeniacum%5C+leaves%5C+were%5C+different%5C+with%5C+different%5C+leaf%5C+ages.%5C+The%5C+highest%5C+photosynthetic%5C+capacity%5C+occurred%5C+in%5C+leaf%5C+age%5C+1%5C-2%5C+years%2C%5C+followed%5C+by%5C+1%5C+year%5C+and%5C+2%5C-4%5C+years.%5C+The%5C+highest%5C+photosynthetic%5C+capacity%5C+of%5C+C.%5C+flavum%5C+occurred%5C+in%5C+leaf%5C+age%5C+60%5C+days%2C%5C+followed%5C+by%5C+30%5C+days%2C%5C+90%5C+days%5C+and%5C+120%5C+days.%5C+3.%5C+Photosynthetic%5C+capacities%5C+of%5C+different%5C+leaf%5C+positions%5C+were%5C+mainly%5C+affected%5C+by%5C+leaf%5C+ages%5C+in%5C+P.%5C+armeniacum.%5C+The%5C+four%5C+leaves%5C+lying%5C+on%5C+the%5C+top%5C+did%5C+the%5C+most%5C+accumulation%5C+of%5C+the%5C+assimilation%5C+products%5C+in%5C+the%5C+whole%5C+plant.%5C+The%5C+leaves%5C+of%5C+sequence%5C+number%5C+%3E%5C+6%5C+could%5C+use%5C+lots%5C+of%5C+photosynthates%2C%5C+but%5C+contributed%5C+little%5C+to%5C+the%5C+accumulation%5C+of%5C+biomass.%5C+4.%5C+Photosynthetic%5C+rate%5C+of%5C+P.%5C+armeniacum%5C+decreased%5C+a%5C+little%5C+at%5C+the%5C+noon%2C%5C+and%5C+the%5C+highest%5C+photosynthetic%5C+rate%5C+was%5C+observed%5C+at%5C+10%5C%3A00h%5C+in%5C+the%5C+greenhouse.%5C+The%5C+variation%5C+of%5C+photosynthetic%5C+rate%5C+was%5C+in%5C+the%5C+same%5C+trend%5C+as%5C+stomatal%5C+conductance.%5C+Higher%5C+relative%5C+humidity%5C+seemed%5C+to%5C+be%5C+the%5C+key%5C+for%5C+higher%5C+photosynthetic%5C+rate%5C+in%5C+P.%5C+armeniacum.%5C+5.%5C+The%5C+photosynthetic%5C+capacity%5C+of%5C+C.%5C+flavum%5C+was%5C+statistically%5C+larger%5C+than%5C+that%5C+of%5C+P.%5C+armeniacum.%5C+The%5C+lower%5C+leaf%5C+photosynthetic%5C+capacity%5C+of%5C+P.%5C+armeniacum%5C+was%5C+related%5C+to%5C+its%5C+lower%5C+leaf%5C+nitrogen%5C+concentration%2Cleaf%5C+phosphorus%5C+concentration%5C+and%5C+enzyme%5C+activities.%5C+Meanwhile%2C%5C+the%5C+extremely%5C+lower%5C+stomatal%5C+conductance%5C+and%5C+internal%5C+mesophyll%5C+conductance%5C+might%5C+greatly%5C+limit%5C+the%5C+photosynthetic%5C+capacity%5C+of%5C+P.%5C+armeniacum.%5C+The%5C+lower%5C+stomatal%5C+conductance%5C+and%5C+photosynthetic%5C+rate%5C+of%5C+Paphiopedilum%5C+might%5C+partially%5C+caused%5C+by%5C+the%5C+lack%5C+of%5C+chloroplasts%5C+in%5C+the%5C+guard%5C+cell%5C+of%5C+Paphiopedilum.%5C+Compared%5C+with%5C+C.%5C+flavum%2C%5C+P.%5C+armeniacum%5C+was%5C+more%5C+fond%5C+of%5C+shade%5C+environment.6.%5C+The%5C+short%5C+longevity%5C+leaf%5C+of%5C+Cypripedium%5C+had%5C+bigger%5C+photosynthetic%5C+capacity%5C+and%5C+greater%5C+potential%5C+for%5C+fast%5C+growth.%5C+But%5C+the%5C+longer%5C+LL%5C+of%5C+Paphiopedilum%5C+enhanced%5C+nutrient%5C+conservation%5C+which%5C+could%5C+compensate%5C+its%5C+lower%5C+photosynthetic%5C+capacity.%5C+The%5C+short%5C+longevity%5C+leaf%5C+of%5C+Cypripedium%5C+usually%5C+had%5C+higher%5C+photosynthetic%5C+rate%5C+per%5C+unit%5C+leaf%5C+mass%5C+and%5C+dark%5C+respiration%5C+rate%2C%5C+and%5C+photosynthetic%5C+capacity%5C+decreased%5C+fast%5C+with%5C+leaf%5C+age.%5C+However%2C%5C+for%5C+Paphiopedilum%2C%5C+the%5C+situation%5C+was%5C+the%5C+opposite.%5C+7.%5C+Compared%5C+with%5C+Cypripedium%2C%5C+Paphiopedilum%5C+had%5C+higher%5C+water%5C+use%5C+efficiency%5C+and%5C+lower%5C+photosynthetic%5C+nitrogen%5C+use%5C+efficiency.%5C+8.%5C+The%5C+leaf%5C+of%5C+Paphiopedilum%5C+had%5C+higher%5C+leaf%5C+construction%5C+cost%5C+and%5C+longer%5C+repayment%5C+time%5C+than%5C+that%5C+of%5C+Cypripedium.%5C+The%5C+leaf%5C+structures%5C+and%5C+physiological%5C+functions%5C+of%5C+Paphiopedilum%5C+and%5C+Cypripedium%5C+reflected%5C+the%5C+adaptation%5C+to%5C+their%5C+habitats.%5C+The%5C+leaf%5C+morphological%5C+and%5C+physiological%5C+evolution%5C+of%5C+Paphiopedilum%5C+was%5C+related%5C+to%5C+water%5C+and%5C+resource%5C-conserving%5C+traits%5C+in%5C+the%5C+karst%5C+habitat.%5C+The%5C+leaf%5C+traits%5C+of%5C+Cypripedium%5C+were%5C+the%5C+adaptation%5C+to%5C+the%5C+environment%5C+rich%5C+in%5C+water%5C+and%5C+nutrients%5C+but%5C+easy%5C+to%5C+change%5C+with%5C+seasons.Our%5C+results%5C+provided%5C+evidence%5C+of%5C+divergent%5C+evolution%5C+of%5C+congeneric%5C+orchids%5C+under%5C+natural%5C+selection."},{"jsname":"Plants respond to unpredictable alpine environments by a high degree of specialization in the structural and functional aspects of their flowers and pollination. However, few original data about the reproductive biology of these plants has been documented, particularly in the species-rich Himalaya-Hengduan Mountain regions. Incarvillea Juss. is notable for being a temperate and herbaceous member in the primarily tropical and woody family Bignoniaceae. Most species of the genus occur in alpine areas of the Himalaya-Hengduan Mountain regions. We investigated the reproductive biology of two alpine species, I. mairei and I. lutea. Incarvillea mairei was highly self-compatible, but depended on pollinators for seed production. The main pollinators were Halictus sp and Apis sp. at low altitude, and bumblebee at high altitude. Seed production was severely limited by pollinators, as indicated by supplemental hand-pollination experiments. The extended floral longevity and stigma receptivity greatly compensated for pollinator limitation. Outcrossing rates were high from 0.834 to 0.988 with altitude and cumulative inbreeding depression was 0.088, indicating a predominant outcrossing mating system. The combination of floral traits (approach herkogamy, sensitive stigma, anther appendages) and pollinator activities ensure a remarkably efficient pollination mechanism, as well as make it possible to ensure reproduction success in alpine habitats. Incarvillea lutea is self-compatible, but depends on insects for seed production. Both the fruit and seed set were high under natural conditions. The main pollinator is Halictus sp. The larger floral displays of I. lutea received more visitations, but facilitated geitonogamous pollination simultaneously. The cumulative inbreeding depression was 0.373. The corolla tube changed color with age from yellow to red. Young yellow flowers had a significant greater pollen and nectar reward. The co-occurrence of the change in amount of reward and flower color enabled I. lutea to direct pollinators to visit reproductive, highly rewarding yellow flowers. We suggest floral color change in I. lutea may serve as a mechanism for reducing geitonogamous pollination and increasing the efficiency of pollen transfer to enhance plant fitness.","jscount":"1","jsurl":"/simple-search?field1=all&field=dc.citation.source_filter&advanced=false&query1=Mediterranean%2BCrops&&fq=dc.project.title_filter%3APlants%5C+respond%5C+to%5C+unpredictable%5C+alpine%5C+environments%5C+by%5C+a%5C+high%5C+degree%5C+of%5C+specialization%5C+in%5C+the%5C+structural%5C+and%5C+functional%5C+aspects%5C+of%5C+their%5C+flowers%5C+and%5C+pollination.%5C+However%2C%5C+few%5C+original%5C+data%5C+about%5C+the%5C+reproductive%5C+biology%5C+of%5C+these%5C+plants%5C+has%5C+been%5C+documented%2C%5C+particularly%5C+in%5C+the%5C+species%5C-rich%5C+Himalaya%5C-Hengduan%5C+Mountain%5C+regions.%5C+Incarvillea%5C+Juss.%5C+is%5C+notable%5C+for%5C+being%5C+a%5C+temperate%5C+and%5C+herbaceous%5C+member%5C+in%5C+the%5C+primarily%5C+tropical%5C+and%5C+woody%5C+family%5C+Bignoniaceae.%5C+Most%5C+species%5C+of%5C+the%5C+genus%5C+occur%5C+in%5C+alpine%5C+areas%5C+of%5C+the%5C+Himalaya%5C-Hengduan%5C+Mountain%5C+regions.%5C+We%5C+investigated%5C+the%5C+reproductive%5C+biology%5C+of%5C+two%5C+alpine%5C+species%2C%5C+I.%5C+mairei%5C+and%5C+I.%5C+lutea.%5C+Incarvillea%5C+mairei%5C+was%5C+highly%5C+self%5C-compatible%2C%5C+but%5C+depended%5C+on%5C+pollinators%5C+for%5C+seed%5C+production.%5C+The%5C+main%5C+pollinators%5C+were%5C+Halictus%5C+sp%5C+and%5C+Apis%5C+sp.%5C+at%5C+low%5C+altitude%2C%5C+and%5C+bumblebee%5C+at%5C+high%5C+altitude.%5C+Seed%5C+production%5C+was%5C+severely%5C+limited%5C+by%5C+pollinators%2C%5C+as%5C+indicated%5C+by%5C+supplemental%5C+hand%5C-pollination%5C+experiments.%5C+The%5C+extended%5C+floral%5C+longevity%5C+and%5C+stigma%5C+receptivity%5C+greatly%5C+compensated%5C+for%5C+pollinator%5C+limitation.%5C+Outcrossing%5C+rates%5C+were%5C+high%5C+from%5C+0.834%5C+to%5C+0.988%5C+with%5C+altitude%5C+and%5C+cumulative%5C+inbreeding%5C+depression%5C+was%5C+0.088%2C%5C+indicating%5C+a%5C+predominant%5C+outcrossing%5C+mating%5C+system.%5C+The%5C+combination%5C+of%5C+floral%5C+traits%5C+%5C%28approach%5C+herkogamy%2C%5C+sensitive%5C+stigma%2C%5C+anther%5C+appendages%5C%29%5C+and%5C+pollinator%5C+activities%5C+ensure%5C+a%5C+remarkably%5C+efficient%5C+pollination%5C+mechanism%2C%5C+as%5C+well%5C+as%5C+make%5C+it%5C+possible%5C+to%5C+ensure%5C+reproduction%5C+success%5C+in%5C+alpine%5C+habitats.%5C+Incarvillea%5C+lutea%5C+is%5C+self%5C-compatible%2C%5C+but%5C+depends%5C+on%5C+insects%5C+for%5C+seed%5C+production.%5C+Both%5C+the%5C+fruit%5C+and%5C+seed%5C+set%5C+were%5C+high%5C+under%5C+natural%5C+conditions.%5C+The%5C+main%5C+pollinator%5C+is%5C+Halictus%5C+sp.%5C+The%5C+larger%5C+floral%5C+displays%5C+of%5C+I.%5C+lutea%5C+received%5C+more%5C+visitations%2C%5C+but%5C+facilitated%5C+geitonogamous%5C+pollination%5C+simultaneously.%5C+The%5C+cumulative%5C+inbreeding%5C+depression%5C+was%5C+0.373.%5C+The%5C+corolla%5C+tube%5C+changed%5C+color%5C+with%5C+age%5C+from%5C+yellow%5C+to%5C+red.%5C+Young%5C+yellow%5C+flowers%5C+had%5C+a%5C+significant%5C+greater%5C+pollen%5C+and%5C+nectar%5C+reward.%5C+The%5C+co%5C-occurrence%5C+of%5C+the%5C+change%5C+in%5C+amount%5C+of%5C+reward%5C+and%5C+flower%5C+color%5C+enabled%5C+I.%5C+lutea%5C+to%5C+direct%5C+pollinators%5C+to%5C+visit%5C+reproductive%2C%5C+highly%5C+rewarding%5C+yellow%5C+flowers.%5C+We%5C+suggest%5C+floral%5C+color%5C+change%5C+in%5C+I.%5C+lutea%5C+may%5C+serve%5C+as%5C+a%5C+mechanism%5C+for%5C+reducing%5C+geitonogamous%5C+pollination%5C+and%5C+increasing%5C+the%5C+efficiency%5C+of%5C+pollen%5C+transfer%5C+to%5C+enhance%5C+plant%5C+fitness."},{"jsname":"lastIndexed","jscount":"2024-09-26"}],"资助项目","dc.project.title_filter")'>
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