| The assimilate accumulation and transport characteristics of sequential and non-sequential senescence of winter wheat under drought stress after flowering |
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| DOI：10.16302/j.cnki.1000-7601.2015.01.002 |
| Key Words: drought sequential senescence non-sequential senescence assimilate accumulation assimilate transport |
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| Abstract: |
| Under natural weather and drought conditions, green leaf area, photosynthetic rate and sucrose-phosphate synthase activity of top three leaves, assimilate accumulation and transport characteristics in wheat leaf sequential and non-sequential senescence were measured in order to provide insights into the physiological and biochemical mechanisms of wheat leaf non-sequential senescence. The results show that, for natural weather and drought condition, the top 2nd leaf green area, photosynthetic rate and dry matter of inverted stems of Wenmai19, Yumai19 and Lankaoaizao8 are higher than those of flag leaf, indicating earlier senesce of flag leaf than that of top 2nd leaf. Assimilation transportation, transporting rate and contribution rate to grain after anthesis, and leaf sucrose-phosphate synthase activity of inverted stems in two treatments were greater than that of conventional stems, suggesting that wheat leaf non-sequential senescence is associated with the rapid transport of assimilation. Leaf non-sequential senescence is beneficial to grain filling, rendering strong adaptation to drought stress. |
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