Acclimation to irradiance in seedlings of three tropical rain forest Garcinia species after simulated gap formation
Guo, XR; Cao, KF; Xu, ZF
AbstractWe investigated the acclimation of seedlings of three tropical rain forest sub-canopy Garcinia species (G. xanthochymus, G. cowa, and G. bracteata) after transfer from 4.5 (LI) to 40 % (HI) sunlight and 12.5 (MI) sunlight to HI (LH1 and LH2 denoting transfer from Ll to HI and M1 to HI transfer, respectively). The changes of chlorophyll (Chl) fluorescence, net photosynthetic rate (P-N), dark respiration rate (R-D), Chl content per unit area (Chl(area)), leaf mass per unit area (LMA), and seedling mortality were monitored over two months after transfer. These parameters together with leaf anatomy of transferred and control seedlings (kept in LI, M1, and HI) were also examined after two months. No seedlings died during the two months. F-v/F-m, P-N, and Chl(area) of the transferred seedlings decreased in the first 3 to 12 d. LH1 leaves showed larger reduction in F-v/F-m (> 23 % vs. < 16 %) and slower recovery of F-v/F-m than LH2 leaves. P-N started to recover after about one week of I transfer and approached higher values in all G. cowa seedlings and G. xanthochymus LH, seedlings than those before the transfer. However, P-N of G. bracteata seedlings approached the values before transfer. The final P-N values in leaves of transferred G. xanthochynnis and G. cowa seedlings approached that of leaves kept in Hl, while the final PN values of transferred leaves of G. bracteata were significantly lower than that of leaves grown under HI (p < 0.05). R-D of G. vanthochynnts LH1 seedlings and all G. cowa seedlings increased and approached the value of the seedlings in HI. The final Chl(area) of both G. xanthochymus and G. cowa approached the values before transfer, but that of G. bracteata did not recover to the level before transfer. The final Chl(area) of all transferred seedlings was not significantly different from that of seedlings in HI except that G. cowa LH1 seedlings had higher Chl(area) than that in HI. LMA decreased within 2 d and then increased continuously until about 30 d and approached the value under HI. Spongy/palisade mesophyll ratio decreased after transfer because of the increase in palisade thickness. Leaf thickness did not change, so LMA increase of transferred seedlings was mainly due to the increase of leaf density. Thus the mature leaves under Ll and MI of G. xanthochymus and G. cowa are able to acclimate to HI by leaf physiological and anatomical adjustment, while G. bracteata had limited ability to acclimate to HI.
KeywordChlorophyll Fluorescence Epidermis Leaf Thickness Photoinhibition Photosynthesis Respiration Species Differences Spongy/palisade Ratio Stomata Density
Subject AreaPlant Sciences
Indexed BySCI
WOS Research AreaPlant Sciences
WOS SubjectPlant Sciences
WOS IDWOS:000237692200006
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Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Kunming Sect, Kunming 650223, Yunnan, Peoples R China
2.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Guo, XR,Cao, KF,Xu, ZF. Acclimation to irradiance in seedlings of three tropical rain forest Garcinia species after simulated gap formation[J]. PHOTOSYNTHETICA,2006,44(2):193-201.
APA Guo, XR,Cao, KF,&Xu, ZF.(2006).Acclimation to irradiance in seedlings of three tropical rain forest Garcinia species after simulated gap formation.PHOTOSYNTHETICA,44(2),193-201.
MLA Guo, XR,et al."Acclimation to irradiance in seedlings of three tropical rain forest Garcinia species after simulated gap formation".PHOTOSYNTHETICA 44.2(2006):193-201.
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