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Introduction of rol Genes into Cotton (Gossypium hirsutum L.) Genome and Effects of Transgene Expression on the Plant Development

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Agricultural Sciences in China 2004年第10期3卷 728-737页

作者： LIUHai-yan YANGYe-hua WUZheng-bin WANGXue-kui YAOMing-jin collegeofplantscienceandtechnology HuazhongAgriculturalUniversityWuhan430070P.R.China

The rol genes cloned from Agrobacterium rhizogenes were transferred to the cotton genomevia Agrobacterium-mediated transformation. Molecular analyses and developmentalidentification of the putative transgenic plants were carried out by means of PCR,Southern blotting and field characterization. The results showed that the expression ofrol genes greatly increased the rooting ability of the transgenic plants, and changed theplant development. Highly male-sterile plants with strong apical dominance and fertileplants with short internodes, stunted growth and improved economic characteristics weresegregated from the T1 transgenic lines of wild rol B gene and the rol B gene driven by35S promoter. The transgenic lines of rol ABC construct usually had normal boll settingand slow growth. Therefore we concluded that the rol genes, modified in suitable ways,could be used to create new cotton varieties with some highly valuable characteristics.

关键词： Upland cotton rol gene Rooting loci Root growth Transformation Developmental character Agrobacterium rhizogenes

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Microscopic Structures of Endosperms Before and After Gelatinization in Rice Varieties with Varied Grain Quality

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Agricultural Sciences in China 2003年第1期2卷 113-118,F003,T002页

作者： YANGZe－min WANGWei－jin LANSheng－yin XUZhen－xiu ZHOUZhu－qing WA CollegeofLifeSciemceandTechnology HuazhongAgriculturalUniversityWuhan430070P.R.China collegeofplantscienceandtechnology Wuhan430070P.R.China

The microscopic structures of the endosperm of indica rice varieties with different quality before and after gelatinization were observed using scanning electron microscope. The results showed that the degree of gelatinization varied in different parts of the grain and in different varieties under the same experimental conditions. The gelatinization of dorsal side was the most complete. Its cells were decomposed totally into puff-like or flocculent materials. The ventral side gelatinized less thoroughly, appearing agglomerate and some cell frames were still visible. The middle part gelatinized most incompletely and the cells were still integrated. Evident differences in gelatinization were observed among different varieties, the dorsal, ventral and middle parts of high quality varieties gelatinized more thoroughly than those of the corresponding parts of low quality varieties respectively. An obvious concavity often appeared in the middle of the cross-section of the low quality grains while the cross-section of high quality grains was normally flat. The same phenomenon was noted when comparing the early maturing indica rice and the late maturing indica rice. Varietal difference of gelatinization in dorsal sides was not as distinct as in middle parts and ventral sides. The difference among dorsal side, middle part and ventral side in gelatinization was greater in low quality grains than that of high quality grains. In addition, a lot of ruptured cells were observed in the cross-section of high quality rice, while few of them could be found in the low quality rice. Apparently, the number of ruptured cells is positively correlated with rice quality. Quality of rice grain also has positive correlation with the rate of water absorption and extension. High rates of water absorption and extension lead to better gelatinization of rice grain, and hence indicate good quality.

关键词： Indica rice Grain quality Gelatinization Microscopic structure

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Phosphorus Nutrient Characteristics of Different Maize (Zea mays L.) Inbreds for Tolerance to Low-P Stress

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Agricultural Sciences in China 2005年第4期4卷 281-287页

作者： ZHANGLi-mei HELi-yuan LIJian-sheng XUShang-zhong CollegeofResourceandEnvironment HuazhongAgriculturalUniversityWuhan430070P.R.China CollegeofAgronomyandBiotechnology ChinaAgriculturalUniversityBeijing100094P.R.China collegeofplantscienceandtechnology HuazhongAgriculturalUniversityWuhan430070P.R.China

Phosphorus nutrient characteristics of different maize inbred lines to low-P stress were studied at stages of seedling, steming, earing, silking under pot culture. In the periods of seedling and steming, P uptake efficiency was the main contributor to P tolerance, and the relative P content in P-tolerant genotypes, 99180 and 99239 were higher than that in sensitive genotype, 99152. At earing stage, P-tolerant genotypes, compared to P-sensitive ones, had higher accumulation of P in upper leaves. When came to the silking stage, P uptake and redistribution efficiency of P-tolerant genotypes were higher than those in 99152. The results also suggested that there are different mechanisms of P nutrient uptake and distribution in different P-tolerant genotypes. Inbred line 99239, according to the investigation, was considered as an efficient stock in the P-uptake while 99180 fallen to the efficient stock of P redistribution.

关键词： Maize Genotypes Tolerance to low-P stress Nutrient characters

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