| Effects of drought stress at tillering stage on photosynthetic characteristics and yield of rice |
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| DOI：10.7606/j.issn.1000-7601.2020.01.18 |
| Key Words: rice tillering stage drip irrigation drought stress photosynthetic characteristics yield |
| Author Name | Affiliation | | XU Qiang | School of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi， Xinjiang 832000， China
Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi, Xinjiang 832000, China | | MA Xiaopeng | Institute of Soil Fertilizer and Agricultural Water Saving, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830000, China
Key Laboratory of Agricultural Environment of Northwest Oasis, Ministry of Agriculture, Urumqi, Xinjiang 830000, China | | LU Tingbo | School of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi， Xinjiang 832000， China
Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi, Xinjiang 832000, China | | WANG Dongwang | School of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi， Xinjiang 832000， China
Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi, Xinjiang 832000, China | | BAI Meng | School of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi， Xinjiang 832000， China
Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi, Xinjiang 832000, China | | WANG Zelin | School of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi， Xinjiang 832000， China
Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi, Xinjiang 832000, China | | NIU Jingran | School of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi， Xinjiang 832000， China
Key Laboratory of Modern Water Saving Irrigation Corps, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| Three water gradients (ralative field capacity 80%~85%, 70%~75%, and 60%~65%) were set up by pit test method to regulate water content during the whole tillering period for 30 days. The effects of drought stress on photosynthetic characteristics and yield of drip\|irrigated rice were analyzed by measuring chlorophyll content, photosynthetic characteristics, leaf area index, tillering dynamics, dry matter accumulation, and yield under different treatments. The results showed that under mild and moderate stress, the total chlorophyll content in leaves increased by 4.66% and 17.62% respectively at jointing stage.The net photosynthetic rate increased by 5.73% and 10.98% at jointing stage and the leaf area index increased by 21.41% and 26.49% at later growth stage.The dry matter accumulation before jointing was reduced and the dynamic of dry matter accumulation was optimized under mild and moderate drought stress, and the tillering number of rice was controlled and the number of effective panicles increased by 8.05% and 23.29% compared with that of CK under mild and moderate drought stress. The number of kernal number and 1000-grain weight under mild and moderate stress were decreased significantly, and the seed setting rate among treatments had no significant difference. The panicle forming rate under different drought stresses at tillering stage were significantly increased by 22.83%, 32.50% and 13.20%, respectively, compared with CK. The yield under mild and moderate stresses increased by 2.73% and 6.08% over that of CK, respectively. The compensation effect of drought stress should be fully utilized in water regulation of drip irrigation rice at tillering stage, and the mild and moderate water control measures should be adopted at tillering stage, which is beneficial to the improvement of photosynthesis and yield of drip irrigation rice. |
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