STEM AND ROOT CHARACTERISTICS ASSOCIATED WITH LODGING RESISTANCE IN 4 WINTER-WHEAT CULTIVARS
STEM AND ROOT CHARACTERISTICS ASSOCIATED WITH LODGING RESISTANCE IN 4 WINTER-WHEAT CULTIVARS
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DOI：
10.1017/s0021859600068428
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发表时间：
1994-10-01
影响因子：
2
通讯作者：
ENNOS, AR
中科院分区：
文献类型：
--
作者：
CROOK, MJ;ENNOS, AR
通过田间试验（1991年9月中旬在英国曼彻斯特大学实验场进行），结合茎和锚定系统的形态和力学测定，研究了4个冬小麦品种根、冠部性状对抗倒性的影响。 品种表现出不同的抗倒伏性：Widgeon最敏感，其次是Galahad，Riband和Hereward，单独。 没有住宿。 抗倒伏性与股骨柄的强度和刚度无关，股骨柄通常足以承受其所承受的力。 相反，大多数植物的根系在土壤中旋转失败。 阻力与短和轻的茎（因此施加到植物的风力和重力），并与高值的锚固强度的根系（因此对力抵抗logding）。 倒伏发生在灌浆期，此时穗最重，土壤湿润。 植物的锚固强度取决于根系的两个特性：基冠根的抗弯强度和伸展角度。 植物更强大，更广泛地传播冠状根产生较大的土壤锥锚固失败，并抵抗较大的力量。 因此，未来的抗倒伏育种应该继续选择茎短、冠状根更硬、分布更广的植物。
The effects of root and shoot characteristics on the lodging resistance of four cultivars of winter wheat were investigated by combining results from a field trial (set up at Manchester University's Experimental Grounds, Jodrell Bank, in mid-September 1991) with morphological and mechanical measurements on their stems and anchorage systems. Cultivars showed contrasting lodging resistance: Widgeon was most susceptible, followed by Galahad, Riband and Hereward which, alone. did not lodge. Lodging resistance was not related to the strength and stiffness of the stems, which were usually adequate to withstand the forces to which they were subjected. Most plants instead failed in their root system which rotated through the soil. Resistance was associated with short and light stems (and hence on the force applied to the plants by wind and gravity) and with high values of the anchorage strength of the root system (and hence on the force resisting logding). Lodging occurred during grain filling when the ears were heaviest and when the soil was wet. The anchorage strength of a plant depended on two characteristics of the root system: the bending strength and the angle of spread of the basal coronal roots. Plants with stronger, more widely spread coronal roots produced larger soil cones during anchorage failure and resisted larger forces. Future breeding for lodging resistance, therefore, should continue to select for plants with shorter stems and with stiffer, more widely spread, coronal roots.