Responses of Two Cultivars of Winter Wheat Differing in Sensitivity to Aluminum ToxicityEnglish Full Text

SHEN ZHEN-GUO; LIAN CHUN-LAN and WU LIE-HONG(Nanjing Agricutural University, Nanjing 210014 China)

Abstract: A experiment was carried to evaluate the effects of A1 on growth, accumulations of free proline and amino acid in 2 wheat cultivars （Triticum aestivum L.）, Yangmai No.5 and Jian 864, differing in A1 sensitivity. Plants grew initially in a nutrient solution without A1 for 13 days before the addition of A1 and finally in a nutrient solution containing 0.5mmol A1 （L（-1）） for 19 days. The results showed that there were marked decreases in dry weight, relative growth rate（RGR） and net assimilation rate （NAR） of A1-treated seedlings compared with control plats. The A1 effects were more evident in Yangmai No.5 than Jian 864. Leaf area ratio（LAR）was little effected by A1. RGR was highly correlated with NAR rather than LAR.Aluminum increased the concentrations of free proline and total free amino acid in shoots of both the cultivars. The increases were greater in Yangmai No.5 than in Jian 864. The percentage of free proline in total amino acid in shoots was not affected by A1 treatment. It was possible that accumulation of proline was merely a symptom of A1 injury. The concentrations of total nitrogen in A1-treated plants did not significantly differ from those of control plants. Nitrate reductase activity（NRA） in leaves was severely decreased by A1,and a greater decrease was noted in Yangmai No.5 than in Jian 864, but NRA in roots of both the cultivars was not affected. The decreases in NRA might be an indirect （accumulation of amino acid） rather than a direct result of A1 toxicity.

Keywords：

aluminum toxicity; free proline; growth analysis; nitrate reductase activity; wheat;

Series：
(D) Agriculture
Subject：
Crop
Classification Code：
S512.206

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Responses of Two Cultivars of Winter Wheat Differing in Sensitivity to Aluminum ToxicityEnglish Full Text

SHEN ZHEN-GUO; LIAN CHUN-LAN and WU LIE-HONG(Nanjing Agricutural University, Nanjing 210014 China)

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