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水分胁迫下光合作用降低是作物减产的主要原因,光合速率下降源自气孔限制和非气孔限制,前者指水分胁迫引起气孔关闭,CO_2供应受阻(Boyer,1970),后者指的是叶肉细胞间隙气相空间和CO_2扩散阻力增大,PSⅡ及光合磷酸化活性下降(Gale,1967),RuBPC及果糖二磷酸酯酶活性下降,RuBP再生受阻(Gerald,1981),光暗呼吸变化等(Hsiao,1973)。已有试验表明,6-BA能促进RuBPC及甘油醛-3-磷酸脱氢酶活力(Harvey,1974),ABA亦能延缓RuBPC和PEPC活性的降低(孙谷畴等,1986)。但ABA和6-BA对水分胁迫下作物光合羧化酶活性的影响报道较少。本文对此进行初步探讨,以阐明ABA和6-BA提高水分胁迫下小
The decrease of photosynthesis under water stress is the main reason of crop yield reduction. The decrease of photosynthetic rate is derived from stomatal limitation and non-stomatal limitation. The former refers to stomatal closure and stomatal closure due to water stress (Boyer, 1970), and the latter refers to mesophyll cell gap (Gale, 1967), RuBPC and fructose diphosphatase activity decreased, RuBP regeneration blocked (Gerald, 1981), light and dark respiratory changes (Hsiao, 1973 ). It has been shown that 6-BA can promote the activity of RuBPC and glyceraldehyde-3-phosphate dehydrogenase (Harvey, 1974), and ABA can also delay the decrease of RuBPC and PEPC activity (Sun et al., 1986). However, the effects of ABA and 6-BA on the photosynthetic carboxylase activity of crops under water stress were less reported. This article conducted a preliminary study to elucidate the ABA and 6-BA improve water stress under small