Air Temperature During Seed Filling and Soybean Seed Germination and Vigor

Abstract

seed quality (Dornbos et al., 1989;Smicklas et al., 1992; Heatherly, 1993), but Vieira et al. (1991Vieira et al. ( , 1992 found no High temperature stress during seed filling in controlled environeffect on germination or vigor in field and greenhouse ments reduces soybean [Glycine max (L.) Merrill] seed germination experiments when the stress did not produce shriveled and vigor, but the effect of high temperature in the field has not been and abnormal seeds. Dry conditions at harvest may indetermined. Seeds of two soybean cultivars (Hutcheson, maturity group [MG] V, and DP4690, MG IV) were produced in the field crease physical injury and reduce quality if seeds are in Kentucky, Mississippi, Arkansas, and Texas in 2000 to 2002. Air handled at low moisture levels (TeKrony et al., 1987). temperature during seed filling was monitored and brown (mature) Temperature extremes during seed development also pods were harvested, hand threshed, and all shriveled and abnormal affect soybean seed quality. Freeze injury before physioseeds were removed before determining standard germination and logical maturity caused large reductions in germination vigor (accelerated-aging germination). Mean maximum temperatures and vigor (Judd et al., 1982). High temperatures also during seed filling (growth stage R5 to R7) ranged from 24.0 (Kenreduced seed germination and vigor in growth chamber tucky) to 37.6؇C (Texas). When seed lots infected with Phomopsis and phytotron experiments (Keigley and Mullen, 1986; longicolla (Hobbs) were removed from the analysis, standard germi-Dornbos and Mullen, 1991; Zanakis et al., 1994; Gibson nation and accelerated-aging germination (AA) decreased as mean and Mullen, 1996; Spears et al., 1997; TeKrony et al., maximum temperature during seed filling increased, but the decrease was significant (P ϭ 0.05) only for Hutcheson. Standard germination 2000; Egli et al., 2005). Temperatures of 33/28ЊC (day/ of Hutcheson declined linearly (r 2 ϭ 0.49) from near 100% at 24؇C night) (Keigley and Mullen, 1986), 35ЊC (Dornbos and to 85% at 36؇C, while the decrease in AA was curvilinear (R 2 ϭ 0.86) Mullen, 1991), 35/30ЊC (Gibson and Mullen, 1996), 38/ and germination reached 11% at 36؇C. Seeds of Hutcheson were more 33ЊC (Spears et al., 1997), and 38/27ЊC (TeKrony et sensitive to high temperature than seeds of DP4690 and seed vigor al., 2000;Egli et al., 2005) during seed filling reduced (AA) was much more sensitive to high-temperature stress than was

Heat shock increases oxidative stress to modulate growth and physico-chemical attributes in diverse maize cultivars

“…The seed germination, seedling emergence and its establishment is extremely affected by HT in a number of plant species, for example, pearl millet and maize (Ashraf and Hafeez, 2004). High temperature changed the seed composition, seed protein expression profiles and reduced the seed germination and vigor, and thus appeared to determine the seed quality attributes (Egli et al, 2005). High temperature stress lowers the activity of specific enzymes and leads to reduce the synthesis of proteins in germinating embryos of the maize (Riley, 1981).…”

Effect of Sprouting Temperature and Air Relative Humidity on Metabolic Profiles of Sprouting Black Gram (Vigna mungoL.)

“…During germination, stored nutrients are utilized to support the process, resulting in altered metabolic profiles (Mubarak 2005). Variation in germination conditions, e.g., temperature, light, moisture and germination time, had different effects on the phytochemicals of sprouts, which vary considerably among plant species and seed varieties (Egli et al 2005).…”

Influence of the Root and Seed Traits on Tolerance to Abiotic Stress

“…for use of reserve seed storage material [23,24,25,26]. This trait has also influence on the root development at the begin of the vegetation period, but there is large variability in water use efficiency of seeds between different species, cultivars from different conditions (seed lots) and even between individual seeds from one seed lot [17,19,35,36,37,38,39,40]. From the common view, the quality of root is modified by genotype, by environmental conditions and also by seed traits, especially thanks to seed vigor and young plants traits, especially at the poor conditions.…”