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Plant growth regulators improve root growth of rice seedlings after mechanical transplanting and increase grain yield

Published online by Cambridge University Press:  08 March 2024

Jichao Tang ,
Zhimin Zhang ,
Shahbaz Atta Tung ,
Bilin Lu  and
Wenjia Yang
Jichao Tang
Affiliation:
Hubei Collaborative Innovation Center for Grain Industry, Agricultural College, Yangtze University, Jingzhou, Hubei, China
Zhimin Zhang
Affiliation:
Hubei Collaborative Innovation Center for Grain Industry, Agricultural College, Yangtze University, Jingzhou, Hubei, China Tianmen Service Center of Modern Agriculture, Tianmen, Hubei, China
Shahbaz Atta Tung
Affiliation:
Department of Agronomy, Pir Mehr Ali Shah-Arid Agriculture University, Rawalpindi, Pakistan
Bilin Lu*
Affiliation:
Hubei Collaborative Innovation Center for Grain Industry, Agricultural College, Yangtze University, Jingzhou, Hubei, China Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Jingzhou, Hubei, China Hubei Provincial Key Laboratory of Waterlogged Disasters and Agricultural Use of Wetland, Jingzhou, Hubei, China
Wenjia Yang*
Affiliation:
Hubei Collaborative Innovation Center for Grain Industry, Agricultural College, Yangtze University, Jingzhou, Hubei, China Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Jingzhou, Hubei, China Hubei Provincial Key Laboratory of Waterlogged Disasters and Agricultural Use of Wetland, Jingzhou, Hubei, China
*
Corresponding authors: Bilin Lu; Email: blin9921@sina.com, Wenjia Yang; Email: wenjiayang123@126.com
Corresponding authors: Bilin Lu; Email: blin9921@sina.com, Wenjia Yang; Email: wenjiayang123@126.com
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Summary

Enhancing seedling quality and promoting root growth post-transplantation are crucial for improving mechanically transplanted rice productivity. Here we investigated the impact of various plant growth regulators on hybrid and conventional rice varieties. Treatments, including two-diethylaminoethyl hexanoate (DA-6, 10 mg L−1), a combination of potassium 3-indole-butyrate + potassium 1-naphthylacetate + 6-benzylaminopurine (C3, 50 + 50 + 10 mg L−1), potassium 3-indole-butyrate + potassium 1-naphthylacetate + 1-triacontanol (C4, 50 + 50 + 50 mg L−1), potassium 3-indole-butyrate + potassium 1-naphthylacetate + 1.8% sodium nitrophenolate (C5, 50 + 50 + 1 mg L−1), and a combination of potassium 3-indole-butyrate + potassium 1-naphthylacetate + 1.8% sodium nitrophenolate + DA-6 (C6, 50 + 50 + 1 + 10 mg L−1), were sprayed either 3 or 10 days before transplanting. Seedlings sprayed 10 days before transplanting exhibited a higher number of white roots and total roots at the returning green stage, along with increased grain yield, irrespective of the plant growth regulator used. The C6 combination emerged as the most effective treatment, enhancing the growth of both hybrid and conventional rice seedlings, accelerating the growth rate of white roots and total roots, and increasing the length of the longest white root during the greening period, ultimately resulting in higher grain yield. Our findings demonstrate that pre-transplantation application of a combination of plant growth regulators positively influences rice seedling growth.

Keywords

Grain yieldplant growth regulatorroot growthtransplanting
Type
Research Article
Information
Experimental Agriculture , Volume 60 , 2024 , e8
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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Footnotes

†

Jichao Tang and Zhimin Zhang contribute equally to this work.

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