盐胁迫对不同类型甜高粱品种产量形成的相关性分析

选用不同类型的14个甜高粱品种,设置4个不同浓度(0、0.3%、0.6%、0.8%)水平的盐胁迫处理,研究了盐胁迫对不同类型甜高粱品种产量形成的影响。试验结果表明,不同类型甜高粱品种的籽粒产量和鲜重产量差异显著,籽粒产量和鲜重产量均随盐浓度的升高而降低,但杂交种降低幅度显著低于常规种,表现出较高的耐盐优势;在高浓度条件下甜高粱的生长发育受到明显抑制,对盐胁迫下最敏感的性状依次为籽粒产量、穗粒重、穗重、穗粒数、千粒重、出苗天数、茎重、叶重、单株鲜重、鲜重产量;由逐步回归统计得出,影响籽粒产量的主要因子有穗粒重、穗重、千粒重、穗长、穗粒数、穗粗,影响鲜重产量的主要因子有单株鲜重、茎重、叶重、鞘重、茎粗、株高。

Analysis of Correlation between Salt Stress and Yield Formation of Different Types of Sweet Sorghum Varieties

In order to study the effect of salt stress on the yield formation of different types of sweet sorghum varieties,fourteen sweet sorghum varieties were treated with four different concentrations(0,0.3%,0.6% and 0.8%) of salt.The results showed that the differences in fresh-weight yield and grain yield among different types of sweet sorghum varieties were significant.The fresh-weight yield and grain yield decreased with the increase of salt concentration.However,the declines in fresh-weight yield and grain yield of hybrid varieties were lower than those of conventional varieties,indicating that hybrid varieties had stronger salt tolerance.The growth and development of sweet sorghum were significantly inhibited under high salt concentration.The most sensitive trait to salt stress was grain yield,followed by grain weight per spike,spike weight,grain number per spike,1000-grain weight,duration from sowing to seedling emergence,stem weight,leaf weight,fresh weight per plant,fresh-weight yield in sequence.The stepwise regressive statistical analysis revealed that the main factors affecting the grain yield were grain weight per spike,spike weight,1000-grain weight,spike length,grain number per spike,and spike diameter.The main factors influential to fresh-weight yield were fresh weight per plant,stem weight,leaf weight,sheath weight,stem diameter and plant height.