摘要:

SUMMARYThe rates of photosynthesis and patterns of translocation of14C from the flag leaves of tall and semi‐dwarf wheat varieties, with and without awns, were compared in a field experiment. The rates of photosynthesis of the awnless varieties fell during the 14 days after anthesis but those of the awned varieties did not change. Wide differences in translocation pattern of14C supplied at anthesis were also found between varieties, but the differences in distribution pattern of14C supplied 14 days later were less. At anthesis, the high yielding semi‐dwarf selection translocated most carbohydrate to the ears and awned selections least. It is suggested that varietal differences in translocation pattern are determined by differences in the capacity of the grain to store carbohydr

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1975.tb01591.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

SUMMARYGenetic differences in bolting resistance between types, between varieties within types and within varieties were demonstrated in some Chantenay and Autumn King carrots and populations derived from crosses between them. The Chantenay type gave a higher proportion of bolters than the Autumn King type. Effects of sowing date and plant density on bolting were also demonstrated, later sowing and higher densities giving lower proportions of bolters. Genotype‐environment interactions were found and the responsiveness of the varieties to environment characterized by linear regression coefficients derived from a joint regression analysis. The most responsive variety tested was Red Cored Chantenay and the least responsive Rialto Improved. Implications of these findings for the breeding of new varieties with earlier harvest periods, and also for the seed multiplication of existing varieties are discusse

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1975.tb01592.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

A mouth suction sampler, commonly and more conveniently and expressively known as a ‘pooter’, is an extremely efficient instrument for collecting small insects quickly and without damage. However, in dusty situations it is difficult to pick up the insects without also getting a mouthful of dust if the usual gauze or muslin is used as the fil

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1975.tb01593.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

SUMMARYExtracts of maize and oat plants from Sweden, infected respectively with cereal tillering disease virus and oat sterile dwarf virus, were examined in the electron microscope after staining with uranyl acetate or potassium phosphotungstate. Such extracts contained whole virus particles, two kinds of subviral particles and virus‐containing tubular structures. The results indicate that the two viruses are morphologically indistinguishable from each other and from maize rough dwarf viru

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1975.tb01594.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY