cardinal temperatures, response to temperature and range of thermal tolerance for seed germination in wheat (triticum aestivum l.) cultivars
Authors
abstract
understanding the seed germination response of cultivated genotypes to temperature is important, agronomically. the genotypes that germinate in lower temperatures could be useful for situations (such as late winter plantings) where temperatures are low in germination stage. therefore, this experiment was conducted to study the cardinal temperatures, response to sub- or supra-optimal temperatures and thermal tolerance of seed germination in 12 wheat cultivars from the north of iran. the effects of seven constant temperatures between 5 and 34 °c on the seed germination characteristics were also evaluated. the base (tb), optimum (to) and maximum or ceiling (tc) temperatures for germination changed from 2.04 to 2.9°c, 31.81 to 32.42°c and 38.08 to 42.08°c, respectively. the analysis of variance revealed no significant differences between cultivars for cardinal temperatures. the effect of cultivar on thermal tolerance was not also significant, but differences between cultivars for thermal tolerance in supra-optimal temperatures were more than sub-optimal temperatures. generally, all cultivars were more responsive to supra-optimal temperatures than sub-optimal temperatures. in the other hand, the slope of regression line of germination rate (gr) versus supra-optimal temperatures was more than that of sub-optimal temperatures. the difference between cultivars was significant in response to sub-optimal temperatures, only. the effect of cultivar, temperature and their interactions on germination characteristics including maximum germination (gmax), time to 10% germination (d10), germination uniformity (gu) and germination rate were significant (p= 0.01), statistically. the evaluated cultivars showed the greatest gmax in 13 or 20, but the greatest gr in 32°c. also, d10 and gu decreased as temperature increased to 25 or 32 and 32 or 34°c, respectively. the results showed that the difference between 5°c and higher temperatures for gmax was very less than gr, d10 and gu. this means high gmax can be obtained in temperatures near to tb under without soilborn pests conditions.
similar resources
evaluation of sesame cultivars germination on response to temperature: determination of cardinal temperatures and thermal tolerance
the aim of this study was to evaluate germination of different sesame genotypes on response to temperature. heat and cold tolerance indexes were determined using cardinal temperatures and evaluations of genotypes were conducted to tolerate high or low temperatures using determined indexes. in order to, germination tests were conducted in fixed temperatures incubators with 10, 15, 20, 25, 30, 35...
full textEffect of Cadmium on Seed Germination and Seedling Growth of Four Wheat (triticum Aestivum L.) Cultivars
Cadmium (Cd) is extremely toxic metal and reduces plant growth. Therefore, study was conducted to evaluate the effect of various Cd levels 0, 5, 20, 50 and 80 mg L on seed germination and seedling growth of four wheat cultivars (Sehar-06, Fareed-06, Inqlab-91, Chakwal-50). Cadmium showed toxicity at 5 mg L in case of root and shoot growth whereas 20 mg L in case of seed germination and germinat...
full textInduction of drought tolerance with seed priming in wheat cultivars (Triticum aestivum L.)
Delay in sowing and low precipitation (<300mm annual) in wheat (Triticum aestivum L.) farming is the major problem in the irrigated and rainfall lands of Iran. A factorial experiment for evaluating the effects of seed priming on wheat cultivars was carried out under laboratory, greenhouse and at two field conditions during seasons of 2008-2010. Arrangement of treatments were Zarrin, Shariar, Sa...
full textVernalisation Response of Some Winter Wheat Cultivars (Triticum aestivum L.)
For 17 cultivars of winter wheat (Triticum aestivum L.) different vernalisation and photoperiod responses were detected. The effect of photoperiod sensitivity was not significantly changed by vernalisation; different vernalisation responses were probably due to the presence of multiple alleles at Vrn loci. The delay in heading depended on the vernalisation deficit exponentially: y = parameter (...
full textInvestigation Germination Characteristics of Wheat (Triticum aestivum L., cv. Chamran) in Response to Seed Aging
BACKGROUND: Seed aging is an important problem in developing countries which seeds stored in inappropriate condition. OBJECTIVES: Current research was carried out to study the effect of seed aging on quantitative parameters of wheat seeds (Chamran cultivar). METHODS: Experiment was carried out based on randomized complete block desi...
full textSeed Borne Mycoflora of Some Commercial Wheat (triticum Aestivum L.) Cultivars in Punjab, Pakistan
Seed borne mycoflora associated with ten commercial varieties of wheat viz. Blue silver, Faisalabad 85, Manthar-3, Pak 81, Parwaz 94, Pirsabaq 2005, Punjnad-1, Sariab-92, Sh-2002 and Wafaq-2001 was investigated through standard blotter paper and agar plate method by using Mann-Whitney U test. At least eleven fungal genera were recovered from seeds. The most frequently isolated fungi were Bipola...
full textMy Resources
Save resource for easier access later
Journal title:
تولید گیاهان زراعیجلد ۳، شماره ۳، صفحات ۲۳-۴۲
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023