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本试验研究了Mg在小麦体内的分布及其再分布,以便建立小麦缺镁的诊断方法。在2种营养液中培养小麦,一种营养液稳定供给Mg(0、5、10、20、40、80、160μM Mg),另一种中断供给Mg(从40和160μM减少到0)。当试验施Mg停止时,老叶的Mg减少。但是,在稳定供给但不足的情况下,嫩叶首先出现镁缺乏症状,这些结果与以前报道相反。嫩叶的Mg浓度也比老叶低,不管叶龄的大小,如果叶组织的Mg浓度<1194μg/g,就会出现黄化和坏死症状。达到最大茎重时,全茎的最低Mg浓度为932μg/g,最嫩幼叶(YEB)的为861μg/g。在可测量的茎重降低之前,嫩叶已出现缺Mg症状。YEB和全茎的Mg浓度与营养液Mg浓度的相关性比老叶的好。
This study investigated the distribution of Mg in wheat and its redistribution in order to establish a diagnostic method for wheat magnesium deficiency. Wheat was cultivated in two nutrient solutions, one of which was a steady supply of Mg (0, 5, 10, 20, 40, 80, 160 μM Mg) and the other discontinued supplying Mg (reduced from 40 and 160 μM to 0). When the test application of Mg stopped, the old leaves of Mg decreased. However, with steady supply but inadequate, young leaves first developed symptoms of magnesium deficiency, which were the opposite of previous reports. The concentration of Mg in young leaves is also lower than that in older leaves, regardless of the size of leaf age. If the Mg concentration in leaf tissue is <1194 μg / g, yellowing and necrosis may occur. At the maximum stem weight, the minimum total Mg concentration in the whole stem was 932 μg / g and that of the most young leaves (YEB) was 861 μg / g. Prior to measurable reduction in stem weight, young leaves have been deficient in Mg symptoms. The correlation between Mg concentration in YEB and whole stem and Mg concentration in nutrient solution was better than that in older leaves.