期刊
AGRONOMY-BASEL
卷 11, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/agronomy11112209
关键词
wheat; waterlogging; carbon assimilation; photosynthetic characteristics; grain filling rate; yield
资金
- National Natural Science Foundation of China [31801287]
- National Key Research and Development Program of China [2017YFD0301306, 2017YFD0301305]
- National College Students' innovation and entrepreneurship training program of China [202110364044]
- Project of China Scholarship Council [201908775002]
Long-term post-flowering soil waterlogging significantly reduces photosynthetic rate, chlorophyll content, and grain yield in wheat crops, with different cultivars responding variably to water stress. The study suggests that wheat cultivar YM18 performs relatively better than YN19 in protecting grain development from waterlogging injury.
In a two-year field study, we quantified the impact of post-flowering soil waterlogging on carbon assimilation and grain yield formation in wheat crops. At anthesis, wheat cultivars YangMai 18 (YM18) and YanNong 19 (YN19) were waterlogged for different durations, i.e., 0 (W0), 3 (W3), 6 (W6) and 9 (W9) days using artificial structures. Changes in leaf physiology, carbon assimilation and biomass production were quantified at 0, 7, 14, and 21 days after anthesis under all treatments. Short-term (W3) waterlogging had no significant effect on wheat crops but W6 and W9 significantly reduced the net photosynthetic rate (Pn), leaf SPAD value, and grain weight of the tested cultivars. Increasing waterlogging duration significantly increased dry matter accumulation in the spike-axis + glumes but reduced dry matter accumulation in grain. Further, the tested cultivars responded significantly variably to W6 and W9. Averaged across two years, YM 18 performed relatively superior to YN19 in response to long-term waterlogging. For example, at 14 days after anthesis, W9 plants of YM18 and YN19 experienced a 17.4% and 23.2% reduction in SPAD and 25.3% and 30.8% reduction in Pn, respectively, compared with their W0 plants. Consequently, YM18 suffered a relatively smaller grain yield loss (i.e., 16.0%) than YN19 (23.4%) under W9. Our study suggests that wheat cultivar YM18 could protect grain development from waterlogging injury by sustaining assimilates supplies to grain under waterlogged environments.
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