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当前在农业生产中,几种主要农作物,如高梁、水稻、棉花、油菜等在生长后期都出现不同程度的早衰现象。在同一地块连年覆膜栽培的作物也出现严重早衰,使作物产量下降,威胁着地膜覆盖新技术的进一步推广。据资料报道,从理论上推算,如能在作物成熟后期,设法使叶的寿命延长一天,则产量可增加2%。由此可见,研究引起叶片衰老的条件和机理在生产实践上有重要意义。
At present, in agricultural production, several major crops, such as sorghum, rice, cotton, rape and so on, all show different degrees of premature aging in later growth stage. Crops planted in successive years in the same parcel also experienced serious premature aging, which led to the decline of crop yield and threatened to further promote the new technology of mulching film. According to the information reported, it is theoretically possible to increase the yield by 2% if one tries to prolong the longevity of the leaf at the later stage of crop maturity. Thus, the study of the conditions and mechanism of leaf senescence is of great significance in the production practice.