Abstract:The natural food contents of silver carp and bighead, containing hoth phytoplankton and zooplankton, are rather similar, but the former takes more minute species than that of the latter. The ratio of the number of individuals of phytoplankton to that of z

Abstract:The paper deals with the feeding habits and sensonal variance of the feeding intensity of Hemibarbus maculatus in lake Nanhu, Wuchang. Specimens were taken from November 1984 to April 1987. It was found that Hemibarbus maculatus feed chiefly on non-spinal

Abstract:This paper reports our studies on esterase isoenzymes of two minute pirate bug populations in the cotton field using polyacrylamide gel electrophoresis. The results showed that there were large differenes in the electrophoretic pattern of the adults and n

Abstract:Pot experiments were conducted to study the effects of boron on the carbon metabolism of ramie ( Boehmeria nivea ) . The main results obtained were summarized as follows: Photosynthetic rate and content of chlorophyll in leaves were significantly affected

Abstract:Previous work showed that the recombinatant plasmid pRaZ15 construed in this laboratory contained the common nod genes of Rhizobium astragali. Incorporation of pRaZ15 into R. astragali Nod~- mutant 7653R+1 (a nod~- mutant of 7653R devoid of Sym-plasmid) r

Abstract:All the 16 possible genotypes of erucic acid in Brassica napus L. were developed from dialtel crosses of four homozygous lines eAeAecec, EaEaecvc , eAeAEcEc and EaEaEcEc. The fatty acid compositions of E_1 and F_2 generations were compared. It was shown t

Abstract:The karyotype of wild rape in Xinjian was studied and compared with that of Juntus ( B. nigra ) which was introduced from West Germany. The results were as follows: the karyotype formula of wild rape in Xinjian is K(2n) = 2x=18=18m(2-4SAT) and that of Jun

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Abstract:To evaluate the extent of genetic similarity between paired isogenic lines carrying various genes for powdery mildew resistance, we tested the reaction of 10 pairs of barley isogenic lines to powdery mildew and examined 7 quantitative characters including

Abstract:The effects of the number of head per plant, number of kernel per head, thousand-kernel-weight and plant-height on the yield in barley were investigated in 1987-1988. The genotypic correlation coefficient between the yield per plant and the other traits w

Abstract:The near isogenic lines were used for evaluating the effects of okra leaf shape on some important characters of cotton cultivars (G. hirsutum L. ) in Wuhan in 1984. The results indicated that the okra leaf shape had no significant effect on yield or other

Abstract:Reaction of 3569 local varieties of rice to bacterial leaf streak ( caused by Xan thomonas campestris PV. Oryzicola ) , collected from Yunnan province in China, was tested under natural infection in 1986. A total of 286(8.02%) varieties were highly resist

Abstract:A cropping system of mushroom year-round production in a simple mushroom house based on seasonal market requirements has been designed and studied. Through two years of experimental studies, a year-round fruiting of mushroom cultivars in the four seasons

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Abstract:Electron microscopic examination of leaf mesophyll cells of sunflower plants grown in boron-deficient soil revealed that the number of chloroplasts and mitochondria and the number of granum of chloroplast were reduced as compared to peants. And the grana

Abstract:Soil erosion in Luotian County and two associated tributaries was surveyed in large scale. It was found that the erosion was most serious at the rolling hills with altitude below 300m, and that increasing vegetation covering is the most efficient measure

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Abstract:Amino acid contents in th blood and wool of 55 German Angora rabbits were measured at two growth stages ( 2-month-old and 5-month-old ) using an automatic acid analyzer. The relationships of different amino acids, and the conrelation between amino acid co