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以红麻细胞质雄性不育系P3A、恢复系992及其杂交种为材料,采用水培法研究了红麻杂交种根系生长对盐胁迫的抗性优势表现。揭示不同程度盐胁迫对红麻杂交种根系生长的影响,以期为红麻杂种优势利用及耐盐红麻杂交种的培育提供理论参考。结果表明:在盐胁迫下,不同基因型对盐胁迫的耐性存在明显差异;红麻杂交种幼苗的根长、根表面积、根体积和根尖数等均优于亲本,存在明显的杂种优势,表现出较强的中亲优势和超高亲优势;随着盐浓度的提高,杂交种与亲本间差异达到显著水平。说明在一定阈值内,红麻杂交种根系生长在盐胁迫下明显表现出比亲本较强的耐性,红麻杂交种在耐盐性方面具有杂种优势。同时盐胁迫改变了红麻根系的形态构型,使根系趋于简单化,可以有效增加根系生长形成更多的粗根,提高其耐盐能力。研究结果为通过杂交育种获得更加耐盐的红麻材料提供了依据。
Using kenaf cytoplasmic male sterile line P3A and restorer line 992 and their hybrids as materials, the resistance performance of root growth of kenaf hybrids to salt stress was studied by hydroponics. The effects of different salt stress on the root growth of kenaf hybrids were revealed in order to provide theoretical references for the heterosis utilization of kenaf and the cultivation of salt-resistant kenaf hybrids. The results showed that under salt stress, the tolerance of different genotypes to salt stress was significantly different. Root length, root surface area, root volume and root tip number of kenaf hybrid seedlings were superior to those of the parent, Showing a strong advantage of middle-pro and high-pro-parents. With the increase of salt concentration, the difference between hybrids and parents reached significant level. The results showed that under certain threshold, root growth of kenaf hybrid obviously showed stronger tolerance than parent under salt stress. Hybrids of kenaf showed heterosis in salt tolerance. At the same time, the salt stress changed the configuration of kenaf root system, and the root system tended to be simple, which could effectively increase root growth to form more coarse root and improve its salt tolerance ability. The results provide the basis for obtaining more salt tolerant kenaf materials through crossbreeding.