scholarly journals Influence of Low/High Temperature on Water Status in Developing and Maturing Rice Grains

2006 ◽  
Vol 9 (4) ◽  
pp. 347-354 ◽  
Author(s):  
Mitsugu Funaba ◽  
Yushi Ishibashi ◽  
Abul Hossain Molla ◽  
Kenji Iwanami ◽  
Mari Iwaya-Inoue
Keyword(s):  
High Temperature ◽  
Water Status ◽  
Rice Grains

scholarly journals Water Status of Flower Buds and Leaves as Affected by High Temperature in Heat-Tolerant and Heat-Sensitive Cultivars of Snap Bean (Phaseolus vulgarisL.)

2003 ◽  
Vol 6 (1) ◽  
pp. 24-27 ◽  
Author(s):  
Tadashi Tsukaguchi ◽  
Yoshinobu Kawamitsu ◽  
Hiroyuki Takeda ◽  
Katsumi Suzuki ◽  
Yoshinobu Egawa
Keyword(s):  
High Temperature ◽  
Water Status ◽  
Flower Buds ◽  
Snap Bean ◽  
Heat Tolerant

Use of plant water relations to assess forage quality and growth for two cultivars of Napier grass (Pennisetum purpureum) subjected to different levels of soil water supply and temperature regimes

2013 ◽  
Vol 64 (10) ◽  
pp. 1008 ◽  
Author(s):  
S. W. Mwendia ◽  
I. A. M. Yunusa ◽  
R. D. B. Whalley ◽  
B. M. Sindel ◽  
D. Kenney ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Water Supply ◽  
Soil Water ◽  
Temperature Regime ◽  
Water Status ◽  
Forage Quality ◽  
Napier Grass ◽  
Pennisetum Purpureum ◽  
High Temperature Regime

Napier grass (Pennisetum purpureum Schumach.) is an important fodder and relatively drought-tolerant crop in tropical and subtropical regions, especially in developing countries. For this and other species, tools are needed for identifying drought-tolerant cultivars to aid selection for semi-arid environments. We determined tissue water status, carbon assimilation, biomass yield and forage quality for Napier grass cvv. Bana and Atherton grown in bins and subjected to three soil-water supply levels (100, 50 or 25% of field capacity) in glasshouses set at either low (15−25°C) or high (25−35°C) temperature regimes, over three growing cycles. Our aim was to explore whether differences in leaf water potential (LWP) and carbon assimilation rates could be reliable indicators of the relative yield potential and forage quality of the two cultivars in environments prone to water and heat stresses. At the low soil-water supply of 25% and low temperature, Bana had lower (more negative) LWP and relative water content (RWC) than Atherton, while at 50% and 100% soil-water supply, Bana had a higher tissue water status. Under the high temperature regime, Bana had consistently more positive LWP and RWC than Atherton, but the differences were not significant. The two cultivars had a similar CO2 assimilation rate (A) and there were no significant differences in the total dry matter yields over the three growing cycles. Water-use efficiency for above-ground biomass (kg ha–1 mm–1) was similar for both cultivars and was 28.5–35.1 under the low temperature regime and 16.9–22.9 under the high temperature regime. Neutral detergent fibre (NDF) was often higher for Bana at low water supply and low temperature than for Atherton, but the trend was reversed under the high temperature regime. Digestibility was generally improved under water-stressed conditions, and there was a positive correlation between NDF and both LWP and RWC measured at midday, but only under the low temperature regime. We conclude that LWP, RWC and A, alone or together, are inadequate for selecting cultivars for dry and hot environments, because cultivars may differ in other mechanistic responses to water stress and high temperatures.

scholarly journals Improvement in rice seed storage longevity from high-temperature drying is a consistent positive function of harvest moisture content above a critical value

2018 ◽  
Vol 28 (4) ◽  
pp. 332-339 ◽  
Author(s):  
K.J. Whitehouse ◽  
F.R. Hay ◽  
R.H. Ellis
Keyword(s):  
High Temperature ◽  
Moisture Content ◽  
Seed Quality ◽  
Water Status ◽  
Seed Longevity ◽  
Effect Of Temperature ◽  
Rice Seed ◽  
Seed Moisture ◽  
Harvest Moisture ◽  
High Temperature Drying

AbstractDrying reduces seed moisture content, which improves subsequent seed survival periods. Diverse maximum temperatures have been recommended to limit or avoid damage to seeds, but some high-temperature drying regimes may improve subsequent seed quality. Seeds from 20 different accessions of five rice (Oryza sativaL.) variety groups (aromatic, Aus, Indica, temperate Japonica, tropical Japonica) were harvested over several seasons at different stages of maturation and either dried throughout at 15°C/15% relative humidity (RH) or for different initial periods (continuous or intermittent) in different drying regimes at 45°C before final equilibrium drying at 15°C/15% RH. Subsequent seed longevity in hermetic storage at 45°C with 10.9% moisture content was determined. In no case did initial drying at 45°C provide poorer longevity than drying at 15°C/15% RH throughout. There was a split-line relation, which did not differ amongst investigations, between longevity after initial drying at 45°C relative to that at 15°C/15% RH throughout and harvest moisture content, with a break point at 16.5% (a seed moisture status of about –14 MPa). Below 16.5%, relative longevity did not differ with harvest moisture content with little or no advantage to longevity from drying at 45°C. Above 16.5%, relative longevity showed a positive relation with harvest moisture content, with substantial benefit from drying at 45°C to subsequent longevity of seeds harvested whilst still moist. Hence, there are temporal (immediatelyex plantacf. subsequent air-dried storage) and water status discontinuities (above cf. below 16.5%) in the effect of temperature on subsequent air-dried seed longevity.

scholarly journals Response of spikelet water status to high temperature and its relationship with heat tolerance in rice

2021 ◽  
Author(s):  
Wencheng Wang ◽  
Kehui Cui ◽  
Qiuqian Hu ◽  
Chao Wu ◽  
Guohui Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Heat Tolerance ◽  
Water Status
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