Studies On The Characteristics Of Development,the Absorption And Distribution Of Nitrogen, Phosphorus And Potassium In Boll Worm Resistant Transgenic Cotton

The study was undertaken on eleven boll worm resistant transgenic cotton cultivars, which were CCRI41, CCRI29, LumianyanNO.15, KemianNO.1, KemianNO.3, GK19, GK99088, LumianyanNO.22, KemianNO.4. SGK321 and LumianyanNO.16,during the 2003 and 2004 growing seasons at the Jiangsu Provincial Key Laboratory of Crops Genetics and physiology, Yangzhou University, Yangzhou, China. The object of this study was to investigate the characteristics of development, the carbon and nitrogen metabolism and the absorption and distribution of nitrogen, phosphorus and potassium. The main results were as follows:1, There were four development characteristics for the eleven boll worm resistant transgenic cotton cultivars. CCRI41 , CCRI29, LumianyanNO.15, KemianNO.1 and KemianNO.3 had both strong vegetative and reproductive growth in whole growth period. They had bigger growth rate for plant height and LAI, greater intensity for square appearance and boll setting, and higher dry matter weight for vegetative and reproductive organs, the ratio of the reproductive organs and vegetative organs dry matter weight was about 1:1. GK19 and GK99088 had both strong vegetative and reproductive growth before full-flower period. They had bigger growth rate for plant height and LAI, greater intensity of square appearance and boll setting before the peak-flowering period. They kept the balance between vegetative and reproductive growth. LumianyanNO.22 and KemianNO.4 had both strong vegetative and reproductive growth afterpeak-flowering period. They had lower growth rate for plant height and LAI, and smaller intensity of square appearance and boll setting before peak-flowering period, but greater intensity of square appearance and boll setting, higher reproductive dry matter weight after the peak-flowering period. They were stronger reproductive growth. SGK321 and LumianyanNO.16 had excessive vegetative growth. They had greatest growth rate for plant height and LAI in the whole period, lowest intensity of square appearance and boll setting, and highest vegetative organs dry matter weight of vegetative organs.2, There were same characteristics for the eleven cultivars in carbon and nitrogen physiological metabolism. The cultivars(CCRI41 , CCRI29 , LumianyanNO.15. KemianNO.l and KemianNO.3) had both strong carbon and nitrogen physiological metabolism in the whole period, they had higher contents for leaf total nitrogen, amino acid, soluble protein, soluble sugar, chlorophyll, higher net photosynthetic intensity, and greater enzyme activities for NR, GPT and Sucroase. The GK19 and GK99088 had both strong carbon and nitrogen physiological metabolism before peak flowering period, they had higher contents for leaf total nitrogen, amino acid, soluble protein, soluble sugar, chlorophyll, higher net photosynthetic intensity, and greater enzyme activities for NR, GPT and Sucroase before peak flowering period. LumianyanNO.22 and KemianNO.4 which had both strong carbon and nitrogen physiological metabolism after peak flowering, they had higher contents for leaf total nitrogen, amino acid, soluble protein, soluble sugar, chlorophyll, higher net photosynthesis rate, and greater enzyme activities for NR, GPT and Sucroase after the peak flowering period. SGK321 and LumianyanNO.16 had strong nitrogen metabolism and weak carbon metabolism, they had higher contents for leaf total nitrogen, amino acid, soluble protein, soluble sugar, chlorophyll, higher net photosynthesis rate, and greater enzyme activities for NR and GPT, weaker Sucroase activity.3, There are also four characteristics in absorption and distribution of nitrogen, phosphorus and potassium for the eleven cultivars. The cultivars( CCRI41, CCRI29, LumianyanNO.15, KemianNO.l and KemianNO.3) had greater absorption amount for nitrogen, phosphorus and potassium in thewhole period, especially during June five to July five and July twenty to August thirty. The absorption ratio of nitrogen, phosphorus and potassium was 1: 0.383 ~ 0.395: 1.142 ~ 1...