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PHOTOSYNTHETIC CHARACTERISTICS AND WATER USE EFFICIENCY OF SWEET SORGHUM UNDER DIFFERENT WATERING REGIMES
Xie Tingting1; Su Peixi1; Shan Lishan2
通讯作者Xie Tingting
来源期刊PAKISTAN JOURNAL OF BOTANY
ISSN0556-3321
出版年2010
卷号42期号:6页码:3981-3994
英文摘要

Sweet sorghum (Sorghum bicolor (L.) Moench) has been recognized as an important ethanol crop which can be planted in marginal lands in China, but little is known about its photosynthetic characteristics in this environment. We investigated gas exchange parameters and biomass yield under different watering regimes along the oases chain of the Hexi Corridor in China. The results showed that the net photosynthetic rate (Pn) exhibited a mid-day depression under serious drought stress (SD). However, during the soft dough stage, the diurnal changes in maximum photochemical efficiency of photosystem II, PSII (F(v)/F(m)) showed an obvious decline, indicating the existence of photoinhibition. Under normal water (NW) and moderate drought stress (MD) conditions, there was a unimodal pattern except in the jointing stage under MD, and there was no evidence of photoinhibition. The highest water use efficiency (WUE) occurred under MD in the early and middle growth stages, while it was highest under SD in the late growth stage. With increasing drought stress, the light compensation point (LCP) increased, whereas the light saturation point (LSP), the apparent quantum yield (AQY) and dark respiration rate (Rd) declined. The stem fresh biomass was highest under MD (77 t.hm(-2)). The main conclusion of the study was that SD caused photoinhibition of sweet sorghum and decreased WUE and stem biomass. Under NW, photoinhibition was avoided and stem biomass increased, however, WUE decreased. As a result, the highest WUE and stem biomass of sweet sorghum was achieved under MD.


类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000285724900034
WOS关键词GAS-EXCHANGE ; GENETIC DIVERSITY ; HALOXYLON-AMMODENDRON ; CHINA ; STRESS ; L. ; PERFORMANCE ; PARAMETERS ; RESPONSES ; DEFICITS
WOS类目Plant Sciences
WOS研究方向Plant Sciences
来源机构中国科学院西北生态环境资源研究院
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/165864
作者单位1.Chinese Acad Sci, Linze Inland River Basin Res Stn, Plant Stress Ecophysiol & Biotechnol Lab, Cold & Arid Regions Environm & Engn Res Inst, Lanzhou 730000, Peoples R China;
2.Gansu Agr Univ, Dept Forestry, Lanzhou 730070, Peoples R China
推荐引用方式
GB/T 7714
Xie Tingting,Su Peixi,Shan Lishan. PHOTOSYNTHETIC CHARACTERISTICS AND WATER USE EFFICIENCY OF SWEET SORGHUM UNDER DIFFERENT WATERING REGIMES[J]. 中国科学院西北生态环境资源研究院,2010,42(6):3981-3994.
APA Xie Tingting,Su Peixi,&Shan Lishan.(2010).PHOTOSYNTHETIC CHARACTERISTICS AND WATER USE EFFICIENCY OF SWEET SORGHUM UNDER DIFFERENT WATERING REGIMES.PAKISTAN JOURNAL OF BOTANY,42(6),3981-3994.
MLA Xie Tingting,et al."PHOTOSYNTHETIC CHARACTERISTICS AND WATER USE EFFICIENCY OF SWEET SORGHUM UNDER DIFFERENT WATERING REGIMES".PAKISTAN JOURNAL OF BOTANY 42.6(2010):3981-3994.
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