盐胁迫下不同耐盐性的陆地棉品种脱落规律及机理

Abscission and its Mechanism of Three Different Salt-tolerant Types of Upland Cotton under the Stress of Salinity

NaCl胁迫下研究了三个不同耐盐水平(不耐盐、稍耐盐、较耐盐)的棉花材料的蕾、花、铃脱落及其规律。低浓度NaCl(0.20%)仅对耐盐性差的材料的脱落率的有显著影响,不耐盐材料的脱落率的次序是蕾>花>幼铃>大铃,对稍耐盐材料的蕾、花也存在显著影响。在高浓度NaCl(0.40%)下,脱落率取决于材料的耐盐性,其脱落率次序是:不耐盐材料>稍耐盐材料>较耐盐材料,耐盐性与脱落率呈负相关,耐盐性高的材料其脱落率较低。不同耐盐性能的材料的蕾、花、铃脱落率存在显著差异;不耐盐材料的脱落率依次为:蕾=花>幼铃>大铃;较耐盐材料的脱落率依次为:蕾>花=幼铃>大铃;较耐盐材料的脱落率依次为:蕾>幼铃>花,在NaCl(0.40%)以下的浓度都不会对较耐盐材料的大铃产生影响。

The abscission of the buds, flowers, and bolls of upland cotton was studied under the stress of NaCl by using the three different salt-tolerant types such as salt sensitive （SS）type, sah-low-tolerant（SLT） type, and sah-high-tolerant（SHT）type. NaCl decreased the cotton setting of buds, flowers and bolls. At the lower concentration（0.2% NaCl）, NaCl increased the abscission of the SS type and the SLT type. The order of the abscission at the lower concentration is, bud〉flower〉littlle boll〉big boll. NaCl greatly affected abscission, the order of materials is： SS〉SLT〉SHT. And the abscission was inverse to the salinity-resistance ability. The orders of abscission among materials were different. The abscission orders of the salinity-sensitive materials are, bud= flower〉 small boll〉 big boll ; and the abscission order of SLT, bud〉 flower = small boll 〉big boll; and the abscission order of the SHT is, bud〉small boll〉flower〉big boll, and big boll was affected little under treatment of high NaCl.