Effects of Plant Hormones on the Hydrotropism and Gravitropism of Medicago falcata Root Tips

doi:10.11733/j.issn.1007-0435.2025.06.013

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (6): 1826-1833.DOI: 10.11733/j.issn.1007-0435.2025.06.013

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Effects of Plant Hormones on the Hydrotropism and Gravitropism of Medicago falcata Root Tips

LU Hui^1,2, LI Qian¹, KAN Hai-ming², XU Heng-kang², PANG Zhuo², ZHANG Guo-fang², WANG Yu-xiang¹, CHEN Chao²

1. College of Grassland Science, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China;
2. Institute of Grassland, Flowers and Ecology, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China

Received:2024-07-30 Revised:2024-09-18 Online:2025-06-15 Published:2025-06-13

植物激素对黄花苜蓿根尖向水性和向地性的影响

逯辉^1,2, 李倩¹, 阚海明², 徐恒康², 庞卓², 张国芳², 王玉祥¹, 陈超²

1. 新疆农业大学草业学院, 新疆乌鲁木齐 830052;
2. 北京市农林科学院草业花卉与景观生态研究所, 北京 100097

通讯作者: 王玉祥,E-mail:wyx9868@163.com;陈超,E-mail:xiaoyingwulu@163.com
作者简介:逯辉（2000-），男，汉族，青海西宁人，硕士研究生，主要从事牧草遗传育种与草地生态研究，E-mail：luwade2000@163.com
基金资助:
农业部苜蓿育种专项（2022ZD0401104）；“蒙科聚”创新驱动平台协同创新区外合作机构建设（2023MKJ0023）；华北农牧交错带草地土壤改良与功能微生物协同提升地力机制与效果研究（KJCX20240319）资助

Abstract

Abstract: The hydrotropism and gravitropism of root tip determine the direction of plant root growth in the soil， but the ways in which auxin and cytokinin regulate hydrotropism and gravitropism are still controversial. In this study， four ecotypes of Medicago falcata resources were used as materials， plant growth regulators were added， and the hydrotropic and gravitropic bending angles of their root tips were measured. The results showed that 4-CPA， TIBA and colchicine could significantly inhibit the hydrotropic and gravitropic curvature of Medicago falcata， while lovastatin had no significant effect on the hydrotropic and gravitropic curvature， suggesting that the hydrotropism and gravitropism of the root tip in Medicago falcata was dependent on the polar transport of auxin and cell division of the root tip. Additionally， the study found a negative correlation between the hydrotropism and gravitropism of the tested Medicago falcata and precipitation levels in their native habitats. This research elucidated the roles of auxin and cytokinin in the regulation of hydrotropism and gravitropism in Medicago falcata， promoted the study of tropism in Medicago species， provided a theoretical basis and technical support for the breeding of drought-tolerant， high-yield alfalfa， and offered insights for future studies as well.

Key words: Auxin, Cytokinin, Gravitropism, Hydrotropism, Medicago falcata

摘要： 向水性与向地性共同决定了植物根系在土壤中的生长方向，但植物激素调控向水性与向地性的方式仍有待明确。本研究以4种生态型的黄花苜蓿（Medicago falcata）资源为材料，添加植物生长调节剂，测量其根尖向水、向地弯曲角度。结果表明，对氯苯氧乙酸、三碘苯甲酸和秋水仙素都可以显著抑制黄花苜蓿的向水性和向地性，而洛伐他汀对其向水性和向地性都没有显著影响，表明黄花苜蓿根尖的向水性和向地性依赖于生长素的极性运输和根尖细胞分裂。同时，研究发现供试黄花苜蓿的向水、向地性与其生境降水量负相关。本研究探明了生长素与细胞分裂素参与黄花苜蓿向水性与向地性的方式，深化了对于苜蓿属植物向性的研究，也可为耐旱、高产苜蓿的选育提供理论基础与技术支撑。

关键词: 生长素, 细胞分裂素, 向地性, 向水性, 黄花苜蓿

CLC Number:

S541.9

LU Hui, LI Qian, KAN Hai-ming, XU Heng-kang, PANG Zhuo, ZHANG Guo-fang, WANG Yu-xiang, CHEN Chao. Effects of Plant Hormones on the Hydrotropism and Gravitropism of Medicago falcata Root Tips[J]. Acta Agrestia Sinica, 2025, 33(6): 1826-1833.

逯辉, 李倩, 阚海明, 徐恒康, 庞卓, 张国芳, 王玉祥, 陈超. 植物激素对黄花苜蓿根尖向水性和向地性的影响[J]. 草地学报, 2025, 33(6): 1826-1833.

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Effects of Plant Hormones on the Hydrotropism and Gravitropism of Medicago falcata Root Tips

植物激素对黄花苜蓿根尖向水性和向地性的影响

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