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利用不同磷效基因型大豆:磷高效品种(HP134、HP119)、磷低效品种(LP113、LP102),采用盆栽控制磷供应量(低磷和高磷),探讨其生长关键时期(花期、结荚期、鼓粒期)的根系形态变化,以期从根系形态学特点为筛选磷高效利用基因型大豆提供一定的理论基础。结果表明:在低磷处理下,磷高效品种的根系适应性强,根系通过增加根长、根总表面积、根体积、根直径、总根毛数来增强对土壤中磷素的吸收,但HP119和HP134两者适应低磷的根部表现又有所不同;磷低效品种根系适应性较差,其根长、根总表面积、根体积、总根毛数在不同处理下相差很大,多数都呈显著甚至极显著差异,且各项数值在低磷处理下远低于高磷处理。由此可见,在大豆生长关键时期可以利用根系形态变化来较好的区分筛选不同磷效基因型。
Phytoavailability (low phosphorus and high phosphorus) of potassic plants was studied by using different high efficiency phosphorous genotype soybean (HP134, HP119) and low phosphorus inefficiency cultivar (LP133, LP102) Pod stage and Drum stage), in order to provide some theoretical basis for selecting efficient soybean genotypes from morphological characteristics of roots. The results showed that the phosphorus-efficient varieties had stronger root adaptability under phosphorus deficiency. Roots increased the phosphorus uptake in the soil by increasing root length, total root surface area, root volume, root diameter and total number of root hairs. However, The results showed that the root adaptability of HP134 was different from that of low phosphorus. The root adaptability of low phosphorus inefficient cultivars was poor. The root length, root total surface area, root volume and total root hairs varied greatly under different treatments, most of them were significant Even very significant differences, and the value of the low-phosphorus treatment is much lower than the high-phosphorus treatment. Thus, in the critical period of soybean growth, root morphological changes can be used to better distinguish between different phosphorus efficiency genotypes.