Root growth in field-grown winter wheat: Some effects of soil conditions, season and genotype.
Root growth in field-grown winter wheat: Some effects of soil conditions, season and genotype.
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DOI：
10.1016/j.eja.2017.09.014
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发表时间：
2017-11
期刊：
影响因子：
--
通讯作者：
Whalley WR
中科院分区：
文献类型：
--
作者：
Hodgkinson L;Dodd IC;Binley A;Ashton RW;White RP;Watts CW;Whalley WR
我们提出的证据来支持这一假设，即在英国种植的冬小麦根长密度和土壤深度之间的关系的一般和有据可查的形状与土壤强度随深度的增加。土壤环境对根长分布的影响大于遗传效应，这很可能与土壤饱和度有关。在干旱季节，生根深度存在基因型差异。在矮秆近等基因系中，深层根长较大，这表明深层根并不简单地与株高有关。通过对不同基因型冬小麦根长分布的比较，并结合土壤物理指标，试图解释根长密度与土壤深度的关系。通过田间试验比较了不同小麦品系的生长，包括近等基因系（Rht-B1 a高近等基因系和Rht-B1 c矮近等基因系）和商业种植的小麦品系（cv. Battalion，Hystar Hybrid，Istabraq，and Robigus）.连续两年在雨水灌溉条件下进行了试验。测定了土壤含水量、温度和土壤电阻率剖面，并取土芯，用断芯法和洗根法估计了孔隙分布的垂直剖面和根数。根长分布年间差异很大。2014/2015年土壤湿润与根系较浅有关。虽然在2014/2015年没有基因型效应，但在2013/2014年，矮秆小麦在深层有最多的根。在较浅的土层中，一些小麦线，特别是营，似乎更好地穿透非结构性土壤。根长密度随深度的增加而迅速下降，这可能是根长电阻随深度增加而增加的原因。两年内根系剖面的差异大于基因型的差异，这表明不同基因型效应的比较需要考虑不同的土壤条件和季节差异。我们还表明，高产不一定与资源获取，这似乎并没有限制在低产矮近等基因系。
We present evidence to support the hypothesis that the general and well-documented shape of the relationship between root length density and soil depth in UK grown winter wheat is related to the increase in soil strength with depth. Effects of the soil environment on root length distribution were greater than genetic effects and this was most likely related to soil saturation. In a dry season, there was genotypic variation in rooting depth. Greater root length at depth in the dwarf NILs suggests that deep rooting is not simply related to plant height. This work compared root length distributions of different winter wheat genotypes with soil physical measurements, in attempting to explain the relationship between root length density and soil depth. Field experiments were set up to compare the growth of various wheat lines, including near isogenic lines (Rht-B1a Tall NIL and Rht-B1c Dwarf NIL) and wheat lines grown commercially (cv. Battalion, Hystar Hybrid, Istabraq, and Robigus). Experiments occurred in two successive years under rain fed conditions. Soil water content, temperature and penetrometer resistance profiles were measured, and soil cores taken to estimate vertical profiles of pore distribution, and root number with the core-break method and by root washing. Root length distributions differed substantially between years. Wetter soil in 2014/2015 was associated with shallower roots. Although there was no genotypic effect in 2014/2015, in 2013/2014 the dwarf wheat had the most roots at depth. In the shallower layers, some wheat lines, especially Battalion, seemed better at penetrating non-structured soil. The increase in penetrometer resistance with depth was a putative explanation for the rapid decrease in root length density with depth. Differences between the two years in root profiles were greater than those due to genotype, suggesting that comparisons of different genotypic effects need to take account of different soil conditions and seasonal differences. We also demonstrate that high yields are not necessarily linked to resource acquisition, which did not seem to be limiting in the low yielding dwarf NIL.
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影响因子：
4.9
作者：
HEWITT, JS;DEXTER, AR
通讯作者：
DEXTER, AR
限水环境下小麦根系生长对肥料水平分层的响应
影响因子：
4.9
作者：
Jin, Kemo;Shen, Jianbo;Whalley, William R.
通讯作者：
Whalley, William R.
影响因子：
4.9
作者：
BLACKWELL, PS;WELLS, EA
通讯作者：
WELLS, EA
影响因子：
4.9
作者：
Deery, David M.;Passioura, John B.;Katupitiya, Asitha
通讯作者：
Katupitiya, Asitha
DOI：
10.2136/sssaj1977.03615995004100060004x
发表时间：
1977-01-01
影响因子：
2.9
作者：
HERKELRATH, WN;MILLER, EE;GARDNER, WR
通讯作者：
GARDNER, WR