水分胁迫后复水对豌豆叶片叶绿素含量的影响

采用盆栽人工控水法,研究了水分胁迫及复水对豌豆叶片叶绿素含量的影响。结果表明:苗期水分胁迫,豌豆叶片中叶绿素a、叶绿素b及叶绿素总量上升,均显著或极显著高于对照水平;叶绿素a与b的比值(a/b)则呈现先增大而后又减小的趋势;初花期短历时水分胁迫,叶绿素a、叶绿素b和叶绿素总量均显著高于对照水平,长历时胁迫后,叶绿素各组分含量均低于对照水平;a/b值也是呈现先增大而后又减小的趋势;荚果充实期短历时胁迫后,豌豆叶片中叶绿素a、叶绿素总量高于对照水平,叶绿素b则是轻度胁迫高于对照水平,重度胁迫低于对照水平,a/b值轻度胁迫接近对照水平,重度胁迫高于对照水平;水分胁迫10 d后,叶绿素各组分含量均下降;复水后,叶绿素各组分均表现出了一定程度的补偿效应,且苗期与初花期水分胁迫后复水的补偿效应高于荚果充实期。

Effects of water stress and rewatering on chlorophyll content in pea leaves

A pot experiment was carried under artificial water control to study the effects of water stress and rewater-ing on chlorophyll content in pea leaves .The results showed that the content of chlorophyll a (Chla) ,chlorophyll b (Chlb ) and total chlorophyll (Total chl ) were significantly higher than those of the control treatment (CK ) under water stress at seedling stage .The ratio of chlorophyll a vs .b (a/b) was increased first and then went decreased .At the be-ginning of flowering ,the contents of Chla ,Chlb and Total chl were significantly higher than those of CK under short du-ration of water stress ,and became decreased under long duration of water stress .The a/b ratio was also increased first and was then decreased .At pod filling stage ,the contents of Chla and Total chl were significantly higher than those of CK .The content of Chlb was higher than CK under mild water stress ,but lower than that of CK under the severe stress . The a/b ratio was close to CK under the mild stress ,but higher than CK under severe stress .The chlorophyll composi-tions were decreased after long duration of stress .After rewatering ,there was a compensation effect on chlorophyll com-positions .The compensation effects at seedling stage and at the beginning of flowering were higher than that at pod filling stage .