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首页> 外文期刊>American Journal of Plant Sciences >Impact of Essential Micronutrient, Zn, on Growth and Chlorophyll Biosynthesis in Young &i&Zea mays&/i& Seedlings
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Impact of Essential Micronutrient, Zn, on Growth and Chlorophyll Biosynthesis in Young &i&Zea mays&/i& Seedlings

机译：必需微量营养素Zn对玉米幼龄期生长和叶绿素生物合成的影响。苗

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摘要

The present study analyses growth and chlorophyll biosynthesis in young maize seedlings in response to Zn supply over a wide range of concentrations. Supply of 0 - 5 mM ZnCl _( 2 ) to 3 days old light grown maize seedlings led to gradually increased accumulation of Zn in the shoot tissue, while in the root tissue substantial increase was observed at/and above 0.1 mM ZnCl _( 2 ) . Zn supply significantly reduced the overall growth of maize seedlings mostly at 1 - 5 mM ZnCl _( 2 ) exerting strong correlation and the observed effect was more substantial for root tissue. Amongst the biochemical parameters, increase in protein and proline content was more prominent in root tissue than the shoot, while RNA content was reduced in shoot tissue. Zn treatment to light grown seedlings significantly increased the chlorophyll, carotenoid content, while in dark grown seedlings it had marginalo effect. Delta amino levulinic acid (ALA) content in both the regimes was increased at higher Zn concentrations. Also ALA synthesis was increased in both the regimes, but non significantly. Zn enhanced ALA dehydratase (ALAD) activity of light as well as dark grown seedlings being significant in former. The results demonstrate that the Zn accumulation and growth effect at higher Zn concentrations in maize depend upon the tissue with root as the target site and shoot growth are mainly influenced by ALA and subsequently ALAD in maize seedlings.
机译：本研究分析了在宽浓度范围内对锌供应的响应，年轻玉米幼苗的生长和叶绿素生物合成。向3天大的光生玉米幼苗供应0-5 mM ZnCl _（2）导致枝条组织中Zn的积累逐渐增加，而在根组织中，在0.1 mM ZnCl _（或以上）时显着增加。 ）。锌供应显着降低了玉米幼苗的总体生长，主要是在1-5 mM ZnCl _（2）上表现出很强的相关性，并且观察到的对根组织的影响更大。在生化参数中，根组织中蛋白质和脯氨酸含量的增加比枝条突出，而芽组织中的RNA含量降低。锌对浅色幼苗的处理显着增加了叶绿素，类胡萝卜素的含量，而在深色幼苗中，锌的处理仅具有边际/无作用。两种方案中的δ氨基乙酰丙酸（ALA）含量在较高的Zn浓度下均增加。在这两种方案中，ALA合成也均增加了，但没有明显增加。锌增强了浅色和深色生长幼苗的ALA脱水酶（ALAD）活性。结果表明，玉米中较高锌浓度下锌的积累和生长效应取决于以根为目标部位的组织，而玉米幼苗中ALA和ALAD对芽生长的影响最大。

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