scholarly journals Effect of water stress at different periods on seed yield and water use efficiency of guar under Shambat conditions

2011 ◽  
Vol 02 (03) ◽  
pp. 262-266 ◽  
Author(s):  
Mahmoud Fadl el Mula Ahmed ◽  
Deng Manasseh Mac ◽  
Awatif Abdel Gadir Bashir
Keyword(s):  
Water Stress ◽  
Water Use Efficiency ◽  
Water Use ◽  
Seed Yield ◽  
Effect Of Water ◽  
Use Efficiency

Effect of water stress on growth, water use efficiency and gas exchange as related to osmotic adjustment of two halophytes Atriplex spp.

2013 ◽  
Vol 40 (5) ◽  
pp. 466 ◽  
Author(s):  
Oumelkheir Belkheiri ◽  
Maurizio Mulas
Keyword(s):  
Water Stress ◽  
Water Use Efficiency ◽  
Water Use ◽  
Osmotic Adjustment ◽  
Late Summer ◽  
Field Capacity ◽  
Dry Weight ◽  
Co2 Assimilation ◽  
Effect Of Water ◽  
Use Efficiency

Atriplex halimus L. is known in the Mediterranean basin and along the coastal areas of Sardinia for its adaptability to salinity, although less information is available on the resistance of this species to water stress in absence of salinity. The effect of water stress on growth and water utilisation was investigated in two Atriplex species: A. halimus originating of south Sardinian island and the exotic species Atriplex nummularia Lindl., originating in Australia and widely used in land restoration of arid areas. Water stress was applied to young plants growing in 20 L pots with a sufficient water reserve to store a potentially sufficient water reserve to maintain substrate near to field capacity (30%) between irrigations. Watering was at 70% (control) or 40% (stress) of field capacity. In order to simulate the grazing by livestock, four plant biomass cuttings were conducted at times T0, T1, T2 and T3, corresponding to one cutting at the end of well watered phase (T0) before water stress induction, two cuttings after cycles of 5 weeks each during full summer (T1) and late summer (T2) and one cutting during autumn (T3). All plants remained alive until the end of treatment although growth was strongly reduced. Leaf dry weight (DW) and water use efficiency (WUE) were determined for all cuttings; relative water content (RWC), turgid weight : dry weight ratio (TW : DW), water potential (Ψw), osmotic potential (Ψs), CO2 assimilation, osmotic adjustment (OA), abscisic acid (ABA) and sugar accumulation were determined for the late summer cutting at T2. Water stress induced a decrease in DW, RWC, Ψw, Ψs, TW : DW and CO2 assimilation for both species, but an increase in WUE expressed in terms of dry matter production and a high accumulation of ABA and total sugars mainly for A. halimus. This suggests a more developed adaptive mechanism in this selection. Indeed, the clone was selected from the southern part of the island, where natural populations of saltbush are more exposed to abiotic stresses, mainly the water stress generated not by salinity. A. nummularia showed a greater OA and a positive net solute accumulation as than A. halimus, suggesting that water stress resistance in A. halimus is linked to a higher WUE rather than a greater osmotic adjustment.

Response of four grain legumes to water stress in south-eastern Queensland. III. Dry matter production, yield and water use efficiency

1982 ◽  
Vol 33 (3) ◽  
pp. 511 ◽  
Author(s):  
RJ Lawn
Keyword(s):  
Water Stress ◽  
Water Use Efficiency ◽  
Water Use ◽  
Seed Yield ◽  
Water Availability ◽  
Dry Matter ◽  
Seasonal Pattern ◽  
Dry Matter Production ◽  
Matter Production ◽  
Use Efficiency

Dry matter production, yield and water use efficiency of soybean (Glycine max), black gram (Vigna mungo), green gram (V. radiata) and cowpea (V. unguiculata) under irrigated, rain-fed fallowed and rain-fed double-cropped culture were evaluated at Dalby in south-east Queensland. Differential species responses to cultural treatments were related to strategies of growth and water use in response to water stress. The major effect of differences between strategies related to differences in the short term rate of soil water use, which together with the seasonal pattern of water availability influenced both the total, and seasonal pattern of water use. Regardless of strategy adopted, dry matter production was primarily a function of water use. However, seed yield and water use efficiency for seed yield depended on the seasonal pattern of water use. The relative agronomic success of the various strategies therefore depended on the seasonal profiles of water availability. Some implications of the differences in stress response strategy for adaptation of these species to agricultural environments are discussed.

Effect of water stress on leaf level gas exchange capacity and water-use efficiency of wheat cultivars

2016 ◽  
Vol 21 (3) ◽  
pp. 300-305 ◽  
Author(s):  
Sripati Sikder ◽  
Yunzhou Qiao ◽  
Dong Baodi ◽  
Changhai Shi ◽  
Mengyu Liu
Keyword(s):  
Water Stress ◽  
Gas Exchange ◽  
Water Use Efficiency ◽  
Water Use ◽  
Exchange Capacity ◽  
Wheat Cultivars ◽  
Effect Of Water ◽  
Leaf Level ◽  
Use Efficiency
Sign in / Sign up

Export Citation Format

Share Document