Mapping QTL for seed yield and canning quality following processing of black bean (<Emphasis Type="Italic">Phaseolus vulgaris</Emphasis> L.)

Quantitative trait loci (QTL) analysis was conducted to identify QTL for seed yield and color retention following processing of a recombinant inbred line (RIL) black bean population. A population of 96 RILs were derived from the cross of black bean cultivars ‘Jaguar’ and 115M and evaluated in replicated trials at one location over 4 years (2004–2007) in Michigan. A 119-point genetic map constructed using simple sequence repeat (SSR), sequence related amplified polymorphism (SRAP), target region amplified polymorphism (TRAP) and phenotypic markers spanned fifteen linkage groups (LG) or 460 cM of the bean genome. Fourteen QTL for yield and color retention in four environments were identified by composite interval mapping on six linkage groups. A major QTL SY10.2^J115 for seed yield was identified on LG B10 with additional QTL on B3, B5, and B11. Color retention following processing was associated with loci on B1, B3, B5, B8, and B11. 115M possessed positive alleles for yield, but negative alleles for color retention. Some QTL for yield and color retention co-localized with regions identified in previous studies while others, particularly for color retention, were unique. Additional QTL for agronomic and canning quality traits were detected and individual contributions to future black bean breeding are discussed.     

THE ROLE OF "FOLIC ACID" AND BIOTIN IN THE UTILIZATION OF PANTOTHENIC ACID BY THE RAT

The addition of succinylsulfathiazole to highly purified diets containing all dietary factors known to be required by the rat, including pantothenic acid, results in the appearance of signs of severe pantothenic acid deficiency, including achromotrichia and porphyrin-caked whiskers. These changes are accompanied by a marked reduction in the pantothenic acid content of the liver, and are corrected by the inclusion in such diets of crystalline biotin and "folic acid" concentrates. The utilization of pantothenic acid by the rat appears to depend on the availability of biotin and "folic acid." Under normal conditions these are supplied by the diet and synthesized by intestinal bacteria. A hypothesis is offered in explanation of the chromotrichial actions of "folic acid," biotin and p-aminobenzoic acid.     

Hormonal termination of larval diapause in Dermacentor albipictus

The molting hormone, alpha-ecdysone, and an analog triangle up(7)-5beta-cholestene-2beta,3beta, 14alpha-triol-6-one when applied externally, terminates diapause in larvae of the winter tick, Dermacentor albpictus. This is the first reported hormonal termination of diapause in an arthropod other than an insect.     

农药亚致死剂量对优姬蜂交配行为影响的研究

用１００×１０－６％农梦特和空白农梦特乳油，以及０．０１×１Ｏ－６％氯氰菊酯处理寄生于小菜蛾幼虫的优姬蜂雄蜂，观察农药亚致死剂量对优姬蜂交配行为的影响。结果表明，受农梦特处理的雄蜂只有６８．１８％在遇到雌蜂时引起翅膀扇动。在农梦特和氯氰菊酯处理中，雄蜂对雌蜂在交配行为上的反应迟钝，它们从试验开始到扇动翅膀的时间显著地比对照和空白农梦特乳油的推迟，其交配率分别为２７．２７％和５５％，交配抑制率分别为５３．６８％和３２．０６％。