当前位置： SCI文献检索 > JOURNAL OF EXPERIMENTAL BOTANY期刊下所有文献 > Soil coring at multiple field environments can directly quantify variation in deep root traits to select wheat genotypes for breeding.

Soil coring at multiple field environments can directly quantify variation in deep root traits to select wheat genotypes for breeding.

Abstract：

:We aim to incorporate deep root traits into future wheat varieties to increase access to stored soil water during grain development, which is twice as valuable for yield as water captured at younger stages. Most root phenotyping efforts have been indirect studies in the laboratory, at young plant stages, or using indirect shoot measures. Here, soil coring to 2 m depth was used across three field environments to directly phenotype deep root traits on grain development (depth, descent rate, density, length, and distribution). Shoot phenotypes at coring included canopy temperature depression, chlorophyll reflectance, and green leaf scoring, with developmental stage, biomass, and yield. Current varieties, and genotypes with breeding histories and plant architectures expected to promote deep roots, were used to maximize identification of variation due to genetics. Variation was observed for deep root traits (e.g. 111.4-178.5cm (60%) for depth; 0.09-0.22cm/°C day (144%) for descent rate) using soil coring in the field environments. There was significant variation for root traits between sites, and variation in the relative performance of genotypes between sites. However, genotypes were identified that performed consistently well or poorly at both sites. Furthermore, high-performing genotypes were statistically superior in root traits than low-performing genotypes or commercial varieties. There was a weak but significant negative correlation between green leaf score (-0.5), CTD (0.45), and rooting depth and a positive correlation for chlorophyll reflectance (0.32). Shoot phenotypes did not predict other root traits. This study suggests that field coring can directly identify variation in deep root traits to speed up selection of genotypes for breeding programmes.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Wasson AP,Rebetzke GJ,Kirkegaard JA,Christopher J,Richards RA,Watt M

doi

10.1093/jxb/eru250

subject

Has Abstract

pub_date

2014-11-01 00:00:00

pages

6231-49

issue

eissn

0022-0957

issn

1460-2431

pii

eru250

journal_volume

pub_type

杂志文章

在线工具

Soil coring at multiple field environments can directly quantify variation in deep root traits to select wheat genotypes for breeding.