作物学报 ›› 2016, Vol. 42 ›› Issue (11): 1727-1732.doi: 10.3724/SP.J.1006.2016.01727
• 研究简报 • 上一篇
李阳阳,费聪,崔静,王开勇,马富裕*,樊华*
LI Yang-Yang,FEI Cong,CUI Jing,WANG Kai-Yong,MA Fu-Yu*,FAN Hua*
摘要:
为探讨滴灌甜菜块根膨大期干旱胁迫及复水的生长补偿效应,设置70% (T1)、50% (T2)和30% (T3)田间持水量, 调查块根膨大期对滴灌甜菜产量、农艺性状以及理化指标的影响。结果表明,当土壤为30%田间持水量时,甜菜产量比70%和50%持水量分别提高51.7%和17.6%,产糖量分别提高48.7%和7.7%。与70%持水量相比,50%和30%持水量条件下,块根膨大期甜菜电导率、脯氨酸以及过氧化物酶活性均在复水1 d时显著增加。主成分分析表明,细胞膜透性、抗氧化酶活性以及渗透调节物质以及农艺特性共同调控块根膨大期甜菜抵御干旱胁迫,其中块根可溶性糖含量不能作为甜菜抗旱性鉴定的指标。因此,滴灌甜菜块根膨大期,当土壤含水量下降至田间持水量的30%时及时补充灌溉,不但不影响甜菜生长,还有利于增加块根含糖量。
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