特效烯对小麦临界期干旱的生理调节作用  

PHYSIOLOGICAL EFFECTS OF TETCYCLACIS ON WHEAT UNDER DROUGHT CONDITIONS DURING THE CRITICAL MOISTURE PERIOD

作　　者：汤永禄[1] 杨文钰[1] 李尧权[1] 李光正[1] 

机构地区：[1]四川省农科院作物所,四川农业大学农学院

出　　处：《西南农业学报》1995年第2期36-45,共10页Southwest China Journal of Agricultural Sciences

摘　　要：临界期干旱使小麦后期分蘖多成空穗，有效穗数减少，不孕小穗增多，穗粒数减少，产量显著降低。孕穗前叶面喷施植物生长延缓剂特效烯（Ｔｅｔｃｙｃｌａｃｉｓ）能显著提高受旱小麦叶片的相对含水量，降低质膜相对透性，从而减轻干旱对膜造成的损伤；同时，通过改善幼德水分状况，降低花粉母细胞减数分裂期幼穗ＡＢＡ含量，显著提高了花粉的育性和结实率。孕穗前喷施特效烯对小麦临界期干旱有一定的生理调节作用和抗旱增产的效果。In 1991-1992, pot experiments were conducted to investigate the influence of drought during critical moisture period on the wheat,and to evaluate the effects of tetcyclacis spraying before booting stage on the drought-resistance of triticum aestivum L.,cv.80-8 during critical moisture period. Drought treatment during the critical moisture period reduced the yield of wheat by reducing the number of ears per pot and seed number per ear.Tetcyclacis increased pregnant spikelets and grain number by improving fertility of floret. Tetcyclacis significantly increased the water content in leaves,decteased the relative permeability of membrane and mitigated the damage of membrane duing the critical moisture period.All these were beneficial to various physiological activities.Tetcyclacis also caused an increase of water content and a decrease of ABA content in young ears during the meiosis period of pollen mother cells and, furthermore,an increase of percentage of fertile pollen,which produced higher grain set.

关 键 词：小麦 特效烯 水分临界期 水分胁迫 穗粒数 

分 类 号：S512.101[农业科学—作物学]