摘要
在水分胁迫条件下,对玉米叶片净光合速率、叶绿素含量及叶绿素荧光参数的变化进行了研究。结果表明:玉米叶片净光合速率(Pn)、叶绿素a(Chla)、叶绿素b(Chlb)、总叶绿素含量(Chl)、叶绿素a/b比值(Chla/b)、最大荧光(Fm)和PSⅡ光化学效率(Fv/Fm)比对照均有所下降,基础荧光(Fo)增加;Pn和Chla/b比值占对照百分率与品种抗旱性呈极显著正相关(r=0.880 7**,p<0.01;r=0.880 4**,p<0.01),Fo占对照百分率与品种抗旱性则呈显著负相关(r=-0.764 0*,p<0.05),Fm和Fv/Fm占对照百分率与品种抗旱性则呈显著正相关(r=0.711 6*,p<0.05;r=0.772 3*,p<0.05)。因此,净光合速率、叶绿素a/b比值、Fo、Fm和Fv/Fm可以用来评定不同玉米品种的抗旱性。
The change of net photosynthetic rate of leaf, chlorophyll content and chlorophyll fluorescence parameters were studied under water stress. The result showed that net photosynthetic rate of leaf （Pn） ,chlorophyll a （ Chl a） ,chlorophyll b （ Chl b） ,total chlorophyll content （Chl）, value of chlorophyll a/b （ Chl a/b）, max fluorescence （Fm） and photochemical efficiency of PS Ⅱ （Fv/Fm） were decreased compared with the antitheses. The basis fluorescence （Fo） was increased. The ratio of Pn and Chl a/b in antitheses correlated positively to drought resistance very significantly （r =0.880 7^ ＊ ＊ ,p 〈0.01 ;r =0. 880 4^＊ ＊ ,p 〈0.01 ）. The ratio of Fo in antitheses correlated negative to drought resistance very significantly （ r = - 0.764 0^ ＊ , p 〈 0.05 ）. The ratio of Fm and Fv/ Fm in antitheses correlated positively to drought resistance very significantly. So the net photosynthetic rate, the value of chlorophyll a/b, Fo, Fm and Fv/Fm could be used to evaluate the drought resistance of different sweet maize varieties.
出处
《种子》
CSCD
北大核心
2009年第8期4-8,共5页
Seed
基金
国家重点基础研究发展计划(2009CB118601)
国家科技支撑计划(2006BAD02A13-4-5)
关键词
玉米
抗旱性
净光合速率
叶绿素含量
叶绿素荧光
maize
drought tolerance
net photosynthetic rate
chlorophyll content
chlorophyll fluorescence
