Abstract: The present invention relates to an isolated polynucleotide capable of giving a plant tolerance to drought and/or salt stress, which comprises a polynucleotide sequence as shown in SEQ ID NO:1, and to a promoter capable of giving a plant tolerance to drought and/or salt stress. The present invention also relates to an expression vector comprising the said polynucleotide and/or the said promoter, and to a host cell transformed or transfected by the said expression vector. The present invention further relates to a use of the said polynucleotide or promoter sequence in improvement of plant tolerance to drought and/or salt stress.

Abstract: The present invention discloses the isolation, cloning and use of insecticidal crystal proteins from Bacillus thuringiensis. The present invention isolates a novel insecticidal crystal protein gene cry7Bal from B. thuringiensis subsp. huazhongensis YBT-978 strain, and said gene encodes a novel insecticidal crystal protein Cry7Bal, which shows insecticidal activity against Lepidopteran insects. The present invention also discloses the gene sequence of the novel insecticidal crystal protein, uses suitable expression vectors to transform micro-organisms so as to express the product Cry7Bal encoded by the gene and make it exert the insecticidal activity of the protein against Lepidopteran pests.