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首页> 外文期刊>Journal of Experimental Botany >Comparative analysis reveals gravity is involved in the MIZ1-regulated root hydrotropism
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Comparative analysis reveals gravity is involved in the MIZ1-regulated root hydrotropism

机译：比较分析揭示了重力参与了Miz1-调节的根水流

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摘要

Hydrotropism is the directed growth of roots toward the water found in the soil. However, mechanisms governing interactions between hydrotropism and gravitropism remain largely unclear. In this study, we found that an air system and an agar-sorbitol system induced only oblique water-potential gradients; an agar-glycerol system induced only vertical water-potential gradients; and a sand system established both oblique and vertical water-potential gradients. We employed obliquely oriented and vertically oriented experimental systems to study hydrotropism in Arabidopsis and tomato plants. Comparative analyses using different hydrotropic systems showed that gravity hindered the ability of roots to search for obliquely oriented water, whilst facilitating roots' search for vertically oriented water. We found that the gravitropism-deficient mutant aux1 showed enhanced hydrotropism in the oblique orientation but impaired root elongation towards water in the vertical orientation. The miz1 mutant exhibited deficient hydrotropism in the oblique orientation but normal root elongation towards water in the vertical orientation. Importantly, in contrast to miz1, the miz1/aux1 double mutant exhibited hydrotropic bending in the oblique orientation and attenuated root elongation towards water in the vertical orientation. Our results suggest that gravitropism is required for MIZ1-regulated root hydrotropism in both the oblique orientation and the vertical orientation, providing further insight into the role of gravity in root hydrotropism.
机译：向水性是指根系直接向土壤中的水分生长。然而，控制向水性和向重力性之间相互作用的机制在很大程度上仍不清楚。在这项研究中，我们发现空气系统和琼脂山梨醇系统只引起倾斜的水势梯度；琼脂-甘油系统只诱导垂直水势梯度；沙系统建立了倾斜和垂直水势梯度。我们采用倾斜定向和垂直定向的实验系统来研究拟南芥和番茄植株的向水性。使用不同的亲水系统进行的对比分析表明，重力阻碍了根系寻找倾斜方向水的能力，同时促进了根系寻找垂直方向水的能力。我们发现，向重力性缺失的突变体aux1在倾斜方向上表现出更强的向水性，但在垂直方向上却削弱了根系向水的伸长。miz1突变体在倾斜方向上表现出向水性不足，但在垂直方向上根系向水伸长正常。重要的是，与miz1相比，miz1/aux1双突变体在倾斜方向上表现出向水性弯曲，在垂直方向上表现出向水性延伸的衰减。我们的研究结果表明，在倾斜方向和垂直方向上，MIZ1调节的根系向水性都需要向重力作用，这进一步揭示了重力在根系向水性中的作用。

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  • 来源
    《Journal of Experimental Botany》 |2020年第22期|共15页
  • 作者

    Li Ying; Yuan Wei; Li Luocheng; Dai Hui; Dang Xiaolin; Miao Rui; Baluska Frantisek; Kronzucker Herbert J.; Lu Congming; Zhang Jianhua; Xu Weifeng;

  • 作者单位

    Fujian Agr &

    Forestry Univ Ctr Plant Water Use &

    Nutr Regulat Jinshan 350002 Fujian Peoples R China;

    Fujian Agr &

    Forestry Univ Ctr Plant Water Use &

    Nutr Regulat Jinshan 350002 Fujian Peoples R China;

    Fujian Agr &

    Forestry Univ Ctr Plant Water Use &

    Nutr Regulat Jinshan 350002 Fujian Peoples R China;

    Fujian Agr &

    Forestry Univ Ctr Plant Water Use &

    Nutr Regulat Jinshan 350002 Fujian Peoples R China;

    Fujian Agr &

    Forestry Univ Ctr Plant Water Use &

    Nutr Regulat Jinshan 350002 Fujian Peoples R China;

    Fujian Agr &

    Forestry Univ Ctr Plant Water Use &

    Nutr Regulat Jinshan 350002 Fujian Peoples R China;

    Univ Bonn Inst Cellular &

    Mol Bot D-53115 Bonn Germany;

    Univ Melbourne Fac Vet &

    Agr Sci Sch Agr &

    Food Melbourne Vic 3010 Australia;

    Shandong Agr Univ Coll Life Sci State Key Lab Crop Biol Tai An 271018 Shandong Peoples R China;

    Hong Kong Baptist Univ Stake Key Lab Agrobiotechnol Dept Biol Hong Kong Peoples R China;

    Fujian Agr &

    Forestry Univ Ctr Plant Water Use &

    Nutr Regulat Jinshan 350002 Fujian Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 植物学;
  • 关键词

    Arabidopsis; gravitropism; hydrotropism; MIZ1; root; water potential;

    机译：拟南芥;祖食;水辐射;miz1;根;水潜力;

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