ÃÞ »¨ ѧ ±¨ Cotton Science 2009£¬21(3)£º168-174
Screening of Low Phosphorus Tolerant Cottons with Fusarium and Verticillium Wilts Resistance at Seedling Stage Abstract£ºVermiculite culture and nutrition solution irrigation were carried out simultaneously to approach the screening index for low phosphorus tolerant cotton varieties in order to screen genotypes with high or low phosphorus use efficiency (PUE) among 88 cotton varieties with Fusarium and Verticillium wilts resistance. The result showed that the significant differences were detected in dry seedling weight, fresh shoot weight, the total area of leaves, chlorophyll content, and phosphorus use efficiency among different phosphorus concentration treatments and among cotton varieties. These characters could be regarded as selection indices of the cotton response to phosphorus stress. The differences in plant height and root-shoot ratio were not significant. Eighty-eight cotton varieties with Fusarium and Verticillium wilts resistance were screened for low phosphorus tolerance with these indices and were divided into two groups approximately. One was high phosphorus use efficiency genotypes, including 25 varieties. The other was low phosphorus use efficiency genotypes, including 55 varieties.
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