| Cite this article: | 王克哲,杜亚敏,侯丽丽.干旱胁迫对甜菜块根膨大期光合作用光响应特性的影响[J].灌溉排水学报,,():-. |
| Wang Ke-zhe,DU YA MIN,Hou Li Li.干旱胁迫对甜菜块根膨大期光合作用光响应特性的影响[J].灌溉排水学报,,():-. |
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| Effects of Drought Stress on Photosynthetic Characteristics of Photosynthesis during Sugarcane Root Expansion |
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Wang Ke-zhe, DU YA MIN, Hou Li Li
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YiNing Prefecture Institute of Agricultural Sciences,Yining
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| Abstract: |
| In order to explore the effects of drought stress on photosynthesis photosynthetic characteristics of sugar beet root during expansion period, two irrigation treatments were set up with H1352 and 81GM26 sugar beet varieties, and the simulation results showed that the net photosynthetic rate and light intensity response curves of leaves were simulated. Maximum net photosynthetic rate (Pnmax), dark respiration rate (Rd), apparent quantum efficiency (AQY), light compensation point (LCP) and light saturation point (LSP) are the main photosynthetic parameters. The results showed that the Pn of leaves of H1352 and 81GM26 beeta increased linearly with the increase of PAR, then increased rapidly and eventually became stable or decreased. The net photosynthetic rate (Pn) of H1352 drought stress showed obvious photoinhibition. Under different PAR conditions, the two varieties of Pn were always treated with greater than drought stress, and the difference was more obvious with the increase of PAR. Drought stress significantly reduced the maximum net photosynthetic rate and light saturation point of the leaves (P<0.01). The maximum net photosynthetic rates of H1352 and 81GM26 under drought stress were 24.8μmol.m-2.s-1 and 21.0μmol.m-2.s-1, respectively, which were 18% and 26% lower than the control, respectively; They were 600μmol.m-2.s-1 and 601μmol.m-2.s-1, respectively, which were 18.5% and 16.4% lower than the control, respectively. The light adaptation range of the leaves was narrowed and the light energy utilization ability was reduced. Under the drought stress condition, the dark respiration rate of H1352 varieties decreased significantly, which was 40.3% lower than that of the control, while there was no significant difference between the treatments of 81GM26 varieties. The drought stress of beet roots will affect the photosynthetic capacity of the leaves, and the efficiency of light energy absorption and utilization will be reduced. |
| Key words: sugar beet; photosynthesis response; root enlargement period; drought stress |
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