عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
شماره کتابشناسی ملی
شماره
TLpq304107121
زبان اثر
زبان متن نوشتاري يا گفتاري و مانند آن
انگلیسی
عنوان و نام پديدآور
عنوان اصلي
Influence of total nonstructural carbohydrates on snow mold tolerance in winter wheat
نام عام مواد
[Thesis]
نام نخستين پديدآور
F. Mohammad
نام ساير پديدآوران
R. S. Zemetra
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
University of Idaho
تاریخ نشرو بخش و غیره
1994
مشخصات ظاهری
نام خاص و کميت اثر
88
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
Ph.D.
کسي که مدرک را اعطا کرده
University of Idaho
امتياز متن
1994
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
Snow mold is an important disease of winter wheat in the Pacific Northwest, USA. It is most prevalent when snow covers unfrozen soil for long periods of time. Plants capable of accumulating large amounts of total nonstructural carbohydrates (TNC) before snow fall survive infection by psychrophilic fungi. Studies were conducted to ascertain the heritability of TNC in two hard red winter wheat populations. A preliminary study was arranged with genotypes of known tolerance to snow mold in the greenhouse. An experiment using randomized complete block design with four replications was planted in greenhouse and then transferred to a growth chamber at 4C for imposing fall conditions for TNC accumulation. TNC was determined in all treatments by using the Smith (1969), Weinmann (1947) and Nelson (1944) methods standardized for this project. Statistical analysis showed significant differences for TNC accumulation among genotypes. In growth chamber studies, snow mold tolerant genotypes accumulated significantly higher TNC than susceptible genotypes, confirming the positive correlation between TNC and snow mold tolerance. To ascertain the narrow-sense heritability of TNC, field studies were conducted with lines derived from two hard red winter wheat populations. Three experiments were planted in 5x5 balanced square lattice designs with six replications at Tetonia, Idaho, during 1992-93 and 1993-94. Plant samples were collected prior to snow fall in all experiments and in one experiment, after snow melt, for TNC determination. Genotypes were highly significant (P = 0.01) for TNC, spring stand percentage and plant count in all of the experiments. Genotypic and phenotypic correlations among TNC, stand percentage and plant count were calculated. Narrow-sense heritability was determined for TNC, spring stand percentage and plant count. Irregular infection by Typhula idahoensis occurs in the field in most years in high snow fall areas. The method standardized for TNC extraction and quantification can effectively evaluate 100 plant samples per week. The fall TNC levels were less influenced by environment compared to spring TNC content. The narrow-sense heritability estimates for fall TNC were higher than spring survival. TNC may be used in selection of winter wheat genotypes derived from 'Manning' 2/'Survivor' population for snow mold tolerance and there was no genotypic correlation between TNC and spring survival in 'Blizzard'2/'Sumner' population. Further research needs to be conducted on the specific sugar profiles and degree of polymerization of fructan. The technique used in this study for snow mold screening was found to be genotype dependent.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Agronomy
موضوع مستند نشده
Agronomy
موضوع مستند نشده
Biological sciences
موضوع مستند نشده
Genetics
موضوع مستند نشده
Plant pathology
موضوع مستند نشده
Typhula idahoensis
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )
مستند نام اشخاص تاييد نشده
F. Mohammad
مستند نام اشخاص تاييد نشده
R. S. Zemetra
دسترسی و محل الکترونیکی
نام الکترونيکي
مطالعه متن کتاب وضعیت انتشار
فرمت انتشار
p
اطلاعات رکورد کتابشناسی
نوع ماده
[Thesis]
کد کاربرگه
276903
اطلاعات دسترسی رکورد
سطح دسترسي
a
تكميل شده
Y
