Abstract: In order to determine the role of prior to winter nodal roots per plant,Dwarf Resistant No.58,a semi-winter mature wheat cultivar,was used for field seeding and potted transplanting. In the nursery area before winter,the plants with four tillers (including the main stem) were divided into three groups according to the number of nodal roots. These specific grouping situations were called treatments:less nodal roots number (treatment A,nodal roots:1-2),medium nodal roots number (treatment B,nodal roots:3-4) and more nodal roots number (treatment C,nodal roots:5 and more). The effects of nodal roots number per plant on the development of shoots,physiological potential of the roots and yield were studied. The results showed that the increasing of the prior to winter nodal roots was beneficial to improve the total tiller number,the dry weight of the aerial parts and leaf area per plant during middle and late growth stages,which increased the photosynthetic area of the plant and promoted the aerial parts growth and the dry weight accumulation, there were certain differences between different treatments. Among them,compared with processing A and processing B,the effect of processing C was relatively large. The results also showed that the increase of prior to winter nodal roots number was beneficial to improve the physiological potential of roots,at late dough stage in 2015-2016 and jointing stage in 2016-2017,the differences between different treatments reached a significant level,which means the number of prior to winter nodal roots has positive effects on increasing root biomass and maintaining high root activity during middle and late growing period. Number of spikes,number of spikelets,seed number and grain yield increased with the increasing of prior to winter nodal roots number. Compared with treatment A,the spike number,spikelets number and seed number in treatment C increased by 25.0%,13.4%,26.2%,respectively. And the yield increased by 52.4%. So,under the condition of same tiller number per plant before winter,the more nodal roots per plant of wheat is beneficial to increase grain yield.

Key words: Wheat, Prior-to-winter nodal roots, Middle and late growing periods, Development of aerial plant parts, Grain yield

CLC Number: 

• S512.01