棉 花 学 报 Cotton Science 2007，19(2)：159-封三
Abscission and its Mechanism of Three Different Salt-tolerant Types of Upland Cotton under the Stress of Salinity Abstract：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，salt-low-tolerant(SLT)type，and salt-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.
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