1·Leaf early senescence directly reduces its photosynthetic capacity, decreasing crop yield and grain quality.
水稻叶片早衰直接影响作物的光合效率，减少产量，降低品质。
2·The physiological and biochemical characteristics of different type senescence wheat are studied so as to identify senescence and provide basis for wheat breeding against early senescence.
并研究不同衰老类型小麦发育后期的生理生化特性，以期为小麦早衰鉴定和抗早衰育种提供依据。
3·Thus, if ethrel is applied too early, it may affect the fullness of maturing cotton bolls due to pre- cedable senescence of cotton leaves.
因此，过早使用乙烯利，对未长成的棉铃会因棉叶提前衰老而影响充实。
4·Root and leaf senescence closely related to MDA from the changes, as early as the leaf senescence root, root and exacerbated the trigger senescence leaf senescence.
根系和叶片衰老密切相关，从丙二醛含量的变化看，根系衰老早于叶片，根系衰老引发和加剧了叶片衰老。