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以一年生米槁为试材,在为期22d的自然失水胁迫处理下,研究了米槁生长形态、叶形态解剖结构以及光合色素在不同胁迫时间下的变化特点,以期探讨米槁幼苗对持续干旱胁迫的适应能力及对策。结果表明:随着胁迫时间的增加,其生长指标受显著抑制;叶绿素a、b含量呈先降低后升高再降低的趋势,但叶绿素a/b的趋势相反,类胡萝卜素含量先下降后上升;叶片厚度、上表皮细胞厚度、叶脉周长和面积呈先下降后上升趋势;海绵组织厚度呈上升的趋势,栅栏组织厚度和叶片组织结构紧密度(CTR)呈先下降后上升的趋势。表明米槁在干旱胁迫时可以通过改变叶片内组织结构来提高其抗旱性。
With the annual rice 槁 as test material, under the condition of natural water-deficit stress of 22 days, the morphological changes of rice 解 and morphological changes of leaf morphology and photosynthetic pigments under different stress time were studied in order to investigate the effects of 米 槁 seedling on persistent drought Coercion adaptability and countermeasures. The results showed that: with the increase of stress time, the growth index was significantly inhibited; the content of chlorophyll a, b decreased first, then increased then decreased, but the trend of chlorophyll a / b was opposite; the content of carotenoids decreased first and then increased The leaf thickness, the epidermal cell thickness, the perimeter and the area of the veins at first decreased and then increased. The thickness of the sponge tissue tended to rise. The thickness of the palisade tissue and the leaf tissue structure (CTR) decreased first and then increased. The results showed that S. miltiorrhiza increased its drought resistance by changing the internal structure of leaves during drought stress.