A study of the role of root morphological traits in growth of barley in zinc-deficient soil
A study of the role of root morphological traits in growth of barley in zinc-deficient soil
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DOI：
10.1093/jxb/erm142
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发表时间：
2007-09-01
影响因子：
6.9
通讯作者：
Langridge, P.
中科院分区：
文献类型：
--
作者：
Genc, Y.;Huang, C. Y.;Langridge, P.
全球范围内，锌（Zn）缺乏会降低作物产量。本研究探讨了根系形态特征，尤其是根毛，在植物生长和锌吸收方面的重要性。野生型大麦（Hordeum vulgare）“帕拉斯”及其无根毛突变体brb在不同锌供应水平的土壤和溶液培养中生长了16天。使用WinRHIZOPro图像分析系统测量了根系形态特征（根长、直径和表面积）。在土壤培养中，主要在锌缺乏条件下，“帕拉斯”的地上部干物质、地上部锌浓度、地上部锌含量以及每平方厘米根表面积的锌吸收量均高于brb。“帕拉斯”和brb在锌缺乏时根系均生长得更长。根毛的发育不受植株锌状况的影响。在溶液培养中，所测的任何参数均无显著的基因型差异，这表明brb的突变不影响生长和锌吸收。然而，“帕拉斯”和brb均长出更长更细的根，且根毛生长比在土壤培养中少，并且不受植株锌状况的影响。在缺锌土壤中，与brb相比，“帕拉斯”生长更好且锌吸收量更大，这主要可归因于“帕拉斯”因有根毛而具有更大的根表面积，而非其他根系形态差异。
Zinc (Zn) deficiency reduces crop yields globally. This study investigated the importance of root morphological traits, especially root hairs, in plant growth and Zn uptake. Wild-type barley (Hordeum vulgare) Pallas and its root-hairless mutant brb were grown in soil and solution culture at different levels of Zn supply for 16 d. Root morphological traits (root length, diameter, and surface area) were measured using the WinRHIZOPro Image Analysis system. In soil culture, Pallas had greater shoot dry matter, shoot Zn concentration, shoot Zn content, and Zn uptake per cm 2 root surface area than brb, primarily under zinc deficiency. Both Pallas and brb developed longer roots under Zn deficiency. Development of root hairs was not affected by plant Zn status. In solution culture, there were no significant genotypic differences in any of the parameters measured, indicating that mutation in brb does not affect growth and Zn uptake. However, both Pallas and brb developed longer and thinner roots, and root hair growth was less than in soil culture, and was not affected by plant Zn status. The better growth and greater Zn uptake of Pallas compared with brb in Zn deficient soil can be attributed primarily to greater root surface area due to root hairs in Pallas rather than other root morphological differences.