Effects of daughter tiller removal on shoot and root growth of the parent tiller in Lolium perenne

Grassland Research Pub Date : 2022-07-01 DOI:10.1002/glr2.12023

Arif Hasan Khan Robin, Cory Matthew

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Abstract

Background

This study investigated the effects of daughter tiller removal on parent tiller development in Lolium perenne.

Methods

Plants of L. perenne were grown hydroponically to allow separation of roots by phytomer position on the tiller axis and allowed to form two daughter tillers. In Experiment 1, adult daughter tillers were excised and effects on subsequent main tiller growth were observed for 16 days, on average. In Experiment 2, the growth of main tillers with or without daughter tillers was compared over 90–100 days. Two cultivars, ‘Alto’ bred from New Zealand germplasm and ‘Aberdart’ bred from United Kingdom germplasm were tested.

Results

Excision of adult daughter tillers reduced the dry weight of older roots at the base of parent tiller axes and accelerated new phytomer appearance. Preventing tillers from forming daughter tillers by new tiller excision resulted in increased individual leaf and root dry weight in tillers without daughter tillers.

Conclusions

The data indicated that daughter tillers contributed substrate for root development of their parent tillers. The presence of daughter tillers reduced the size of their main tiller but greatly enhanced whole plant yield.

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除去子蘖对黑麦草茎根生长的影响

本研究探讨了多年生黑麦草除去子代分蘖对亲本分蘖发育的影响。方法采用水培法，利用分蘖体在分蘖轴上的位置使根分离，形成两个子分蘖。试验1切除成虫分蘖，平均观察16 d后对主分蘖生长的影响。试验2在90 ~ 100 d内比较主分蘖与无子分蘖的生长情况。用新西兰种质资源培育的‘Alto’和英国种质资源培育的‘Aberdart’两个品种进行了试验。结果成年子分蘖的切除减少了母分蘖轴基部老根的干重，加速了新分蘖的形成。通过切除新分蘖防止分蘖形成子分蘖，导致无子分蘖分蘖单叶和根干重增加。结论子代分蘖为其亲本分蘖的根发育提供基质。子分蘖的存在减小了主分蘖的大小，但大大提高了整株产量。

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来源期刊

Grassland Research

CiteScore

0.70

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0.00%

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