کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5761614 | 1624659 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dissecting heat stress tolerance in tropical maize (Zea mays L.)
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کلمات کلیدی
PSDChlASIICRISATCIMMYTMTSSSPPGMInternational Maïze and Wheat Improvement CenterSEN - آنGrain yield - عملکرد دانهanthesis-silking interval - فاصله بینابینیChlorophyll content - محتوای کلروفیلInternational Crops Research Institute for the Semi-Arid Tropics - موسسه تحقیقاتی بین المللی برای مناطق گرمسیری نیمه خشکSenescence - پیری
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The negative effects of heat stress on maize growth and reproduction is often expressed in terms of significant yield penalty. Germplasm selection based on yield potential along with heat stress adaptive secondary traits, and establishing their interaction under stress helps in identifying suitable heat tolerant genotypes. To dissect intricate nature of heat stress tolerance, two field trials were conducted during spring 2014 and 2015 under natural heat stress conditions. Planting was adjusted to expose reproductive and grain filling period to high temperature regimes during May month in Hyderabad, India. Correlation analysis between grain yield under stress and secondary traits observed in two year experiments indicated that the traits such as - leaf firing (LF) (r = â0.34** and 0.06), tassel blast (TB) (r = â0.18 and â0.25), tassel sterility (TS) (r = â0.08 and â0.38*), anthesis-silking interval (ASI) (r = â0.24* and â0.02) and senescence (SEN) (r = â0.27** and â0.34*) were negatively correlated, while pollen shedding duration (PSD) (r = 0.33** and 0.4*), seed set percentage (SSP_OP) (r = 0.76** and 0.58**) and chlorophyll content (CHL) (r = 0.55** and 0.41*) were positively associated with grain yield under stress in 2014 and 2015, respectively. An ASI of 2-4 days and PSD of 2-4 days were found advantageous to grain yield under heat stress. Stigma receptivity was less affected under heat stress when compared to pollen viability, yet stigma initiation was delayed under heat stress, which resulted in prolonged ASI. Overall effect of heat stress was expressed in terms of SSP_OP, which explained yield variation by 78.5 and 57.8% for experiment 1 and 2, respectively. Thus, traits that are indicative of reproductive success under heat stress (ASI, TB, TS, pollen viability, stigma receptivity and SSP_OP) and other morpho-physiological traits (LF, SEN and CHL) may be used along with grain yield in index selection of suitable germplasm for heat stress tolerance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Field Crops Research - Volume 204, 15 March 2017, Pages 110-119
Journal: Field Crops Research - Volume 204, 15 March 2017, Pages 110-119
نویسندگان
Md Ashraful Alam, Kaliyamoorthy Seetharam, Pervez Haider Zaidi, Akula Dinesh, Madhumal Thayil Vinayan, Ujjal Kumar Nath,