Light energy utilization and dissipation in seedlings of three tropical rain forest tree species with different ecological habits

Abstract

Abstract: In this study,the light energy allocations between photochemical reactions and heat dissipation in the seedlings of three tropical rain forest tree species were investigated under three light regimes (100%,25% and 8% of full sunlight) by using chlorophyll fluorescence technique.These tree species are Anthocephalus chinensis (Rubiaceae),a pioneer species,Pometia tomentosa (Sapindaceae),a canopy climax species,and Horsfieldia tetratepala (Myristicaceae),a sub-canopy climax species.Under the same light levels,A.chinensis had a highermaximum photosynthetic rate (P_max) and maximum electron transport rate (ETR_max) than P.tomentosa and H.tetratepala.From the light response curves of light energy allocations,all test species had a decreased fraction of light energy allocated to photochemical reactions,while the fraction of light energy allocated to heat dissipation was increased with light intensity.The fractions of light energy allocated to photochemical reactions and heat dissipation were negatively correlated with very high significance.Compared to other two species,A.chinensis allocated more light energy to fractions of photochemical reactions,and had weaker and unsaturated heat dissipation.But,when growing under 100% sunlight,this species had less excess light energy to be used for photosynthesis,so that,it did not suffer from photoinhibition.In contrast,more light energy was allocated to fractions of heat dissipation in both P.tomentosa and H.tetratepala seedlings.Growing under 100% sunlight,these two species received more excess light energy,which caused photoinhibition.Our results support the idea that light requirements for the regeneration of three tropical tree species under different ecological habits are related to their characteristics of light energy utilization and dissipation.

CLC Number:

Q945

ZHANG Jiaolin, CAO Kunfang. Light energy utilization and dissipation in seedlings of three tropical rain forest tree species with different ecological habits[J]. Chinese Journal of Applied Ecology, 2004, (3): 372-376.

References

[1] Adams Ⅲ WW, Demmig-Adams B, Logan BA, et al.1999.Rapid changes in xanthophyll cycle-dependent energy dissipation and photosystem Ⅱ.Efficiency in two vines, Stephania japonica and Smilax australis, growing in the understory of an open Eucalyptus forest.Plant Cell Environ, 22:125～ 136
[2] Ball MC, Butterworth JA, Roden JS, et al.1994.Applications of chlorophyll fluorescence to forest ecology.Austr J Plant Physiol,22:311～319
[3] Bjorkman O, Demmig-Adams B.1987.Photon yield of O2 evolution and chlorophyll fluorescence characteristics at 77K among vascular plants of diverse origins.Planta, 170:489～504
[4] Brodribb T, Hill RS.1997.Light response characteristics of a morphologically diverse group of southern hemisphere conifers as measured by chlorophyll fluorescence.Oecologia, 110:10～ 17
[5] Da Matta FM, Maestri M.1997.Photoinhibition and recovery of photosynthesis in Coffea arabica and C.canephora.Photosynth,34:439～ 446
[6] Demmig-Adams B, Adams Ⅲ WW, Barker DH, et al.1996.Using chlorophyll fluorescence to assess the fraction of absorbed light allocated to thermal dissipation of excess excitation.Physiol Plant, 98:253 ～ 264
[7] Demmig-Adams B, Adams Ⅲ WW.1992.Photoprotection and other responses of plants to high light stress.Annu Rev Plant PhysiolPlant Mol Biol, 43: 599～ 626
[8] Ederli L, Pasqualini S, Batini P, et al.1997.Photoinhibition and oxidative stress: Effects on xanthophyll cycle, scavenger enzymes and abscisic acid content in tobacco plants.J Plant Physiol, 151:422 ～ 428
[9] Egerton JJG, Banks JCG, Gibson A, et al.2000.Facilitation of seedhng establishment: Reduction in irradiance enhances winter growth of Eucalyptus pauciflora.Ecology, 81:1437～ 1449
[10] Gilmore AM.1997.Mechanistic aspects of xanthophyll cycle-dependent photoprotection in higher plant chloroplasts and leaves.Ph ysiol Plant, 99:197～209
[11] Horton P, Ruban AV, Walters RG.1996.Regulation of light harvesting in green plants.Annu Rev Plant Physiol Plant Mol Biol,47: 655～ 684
[12] Krause GH, Koroleva OY, Dalling JW, et al.2001.Acclimation of tropical tree seedlings to excessive light in simulated tree-fall gaps.Plant Cell Environ, 24:1345 ～ 1352
[13] Lin Z-F(林植芳),Peng C-L(彭长连),Sun Z-J(孙梓健),et al.2000.The allocation of photosynthetic electron transport and absorbed light energy in leaves of four woody plants acclimated to differentlightintensities.Acta Phytophysiol Sin(植物生理学报),26(5) :387～392 (in Chinese)
[14] Logan BA, Grace SC, Adams Ⅲ WW, et al.1998.Seasonal differences in xanthophyll cycle characteristics and antioxidants in Mahonia repens growing different light environments.Oecologia, 116:9～17
[15] Long SP, Humphries S, Falkowski PG.1994.Photoinhibition of photosynthesis in nature.Annu Rev Plant Physiol Plant Mol Biol,45: 633～ 662
[16] Lovelock CE, Jebb M, Osmond CB.1994.Photoinhibition and recovery in tropical plant species: Response to disturbance.Oecologia,97: 297 ～ 307
[17] Maxwell K, Johnson GN.2000.Chlorophyll fluorescence-A practical guide.J Exp Bot, 51: 659～ 668
[18] Niyogi KK.1999.Photoprotection revisited:Genetic and molecular approaches.Annu Rev Plant Physiol Plant Mol Biol, 50: 333～359
[19] Pearcy RW.1988.Photosynthetic utilization of lightflecks by understory plants.Aust J Plant Physiol, 15: 223 ～ 238
[20] Powles SB.1984.Photoinhibition of photosynthesis induced by visible light.Ann u Rev Plant Physiol Plant Mol Biol,35:15～44
[21] Riddoch I, Grace J, Fasehun FE, et al.1991.Photosynthesis and successional status of seedlings in a tropical semi-deciduous rain forest in Nigeria.J Ecol, 79: 491 ～ 503
[22] Riddoch I, Lehto T, Grace J.1991.Photosynthesis of tropical tree seedlings in relation to light and nutrient supply.New Phytol, 110:137～ 147
[23] Scholes JD, Press MC, Zipperlen SW.1997.Differences in light energy utilization and dissipation between dipterocarp rain forest tree seedlings.Oecologia, 109: 41 ～ 48
[24] Tinoco-Ojanguren C, Pearcy RW.1995.A comparison of light quality and quantity effects on the growth and steady-state and dynamic tosynthetic characteristics of three tropical tree species.Funct Ecol, 9: 222～230
[25] Verhoeven AS, Demmig-Adams B, Adams Ⅲ WW.1997.Enhanced employment of the xanthophyll cycle and thermal energy dissipation in spinach exposed to high light and N stress.Plant Physiol,113:817～824
[26] Wu Z-Y(吴征镒)1987.The Vegetation of Yunnan.Beijing:Science Press.(in Chinese)
[27] Zhang J-L(张教林),Cao K-F(曹坤芳).2002.The effect ofirradiance on photosynthetic capacity, heat dissipation, and antioxidants of seedlings of two tropical rain forest tree species.Acta Phytoecol Sin(植物生态学报),26(6):639～646(in Chinese)