Residual transpiration rate, epicuticular wax load and leaf colour of pea plants in drought conditions. Influence on harvest index and canopy temperature

2001 ◽  
Vol 15 (1) ◽  
pp. 57-70 ◽  
Author(s):  
Francisco J. Sánchez ◽  
Marı́a Manzanares ◽  
Eusebio F. de Andrés ◽  
José Luis Tenorio ◽  
Luis Ayerbe
Keyword(s):  
Transpiration Rate ◽  
Harvest Index ◽  
Canopy Temperature ◽  
Epicuticular Wax ◽  
Leaf Colour ◽  
Drought Conditions ◽  
Wax Load ◽  
Residual Transpiration

THE EFFECTS OF GLAUCOUSNESS, EPICUTICULAR WAX, LEAF AGE, PLANT HEIGHT, AND GROWTH ENVIRONMENT ON WATER LOSS RATES OF EXCISED WHEAT LEAVES

1988 ◽  
Vol 68 (4) ◽  
pp. 975-982 ◽  
Author(s):  
J. M. CLARKE ◽  
R. A. RICHARDS
Keyword(s):  
Plant Height ◽  
Transpiration Rate ◽  
Water Loss ◽  
Triticum Turgidum ◽  
Leaf Age ◽  
Soil Surface ◽  
Triticum Aestivum L ◽  
Epicuticular Wax ◽  
Growth Environment ◽  
Residual Transpiration

Water loss at minimum stomatal aperture (residual transpiration) from plant surfaces accounts for a substantial proportion of total transpiration during periods of water stress and at night. Its reduction by genetic selection has been suggested as a desirable objective in water-limited environments. To identify genetic and environmental sources of variation in residual transpiration of wheat (Triticum spp.), the effects of glaucousness, epicuticular wax, leaf age, plant height, and growth environment were determined using excised leaves. Glaucousness reduced residual transpiration by an average of 10%. Differing quantities of epicuticular wax and glaucousness in an isogenic pair of genotypes affected residual transpiration as well, the rate being 33% greater in the low wax, nonglaucous than in the high wax, glaucous line. Residual transpiration rate of flag leaves of field-grown plants increased with leaf age, particularly during the 7 d following ligule appearance. The rate of residual transpiration was greater in tall than in dwarf near-isogenic lines. Residual transpiration of leaves from plants grown in glasshouses was 44–66% lower than that of plants grown outdoors, which had a mean rate of 2.68 × 10−5 g H2O cm−2 min−1. Method of water application to glasshouse plants influenced residual transpiration rate. The rate for leaves of plants watered by spraying water onto the plant and soil surface was 20% greater than that of leaves of plants watered on the soil surface only. It was concluded that the increase in residual transpiration rate with leaf age was due to duration of exposure to the rigors of the exterior environment; the absence of this in controlled environments results in lower rates of residual transpiration than in the field.Key words: Cuticular transpiration, Triticum aestivum L., Triticum turgidum L. var. durum, wheat

scholarly journals Genetic correlation and path coefficient analysis in groundnut (Arachis hypogaea L.)

2014 ◽  
Vol 12 (1) ◽  
pp. 96-105
Author(s):  
MK Alam
Keyword(s):  
Harvest Index ◽  
Canopy Temperature ◽  
Positive Association ◽  
Kernel Weight ◽  
Phenotypic Correlation ◽  
Path Coefficient ◽  
Rapid Improvement ◽  
Significant Positive Association ◽  
Pod Yield ◽  
Arachis Hypogaea L

Correlation and path co-efficient analysis were carried out for pod yield and its yield components characters in 45 genotypes of groundnut. The genotypic correlation co-efficient were found to be of relatively higher magnitude than the corresponding phenotypic correlation co-efficient, indicating strong inherent association between the characters. Pod yield showed significant positive association with secondary branches/plant, harvest index, 100-pod weight, 100-kernel weight, pod size, diseases incidence and canopy temperature. Path co-efficient analysis revealed high direct effects of primary branches/plant, secondary branches/plant and harvest index. Hence, it would be rewarding to give due importance on the selection of these characters for rapid improvement in pod yield of groundnut. DOI: http://dx.doi.org/10.3329/sja.v12i1.21116 SAARC J. Agri., 12(1): 96-105 (2014)

Effect of drought stress on residual transpiration and its relationship with water use of wheat

1991 ◽  
Vol 71 (3) ◽  
pp. 695-702 ◽  
Author(s):  
J. M. Clarke ◽  
R. A. Richards ◽  
A. G. Condon
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Transpiration Rate ◽  
Osmotic Potential ◽  
Water Status ◽  
Yield Potential ◽  
Cuticular Transpiration ◽  
Stress Treatment ◽  
Use Efficiency ◽  
Residual Transpiration

Increasing the water use efficiency (WUE) of wheat (Triticum spp.) has long been a goal in semiarid areas. Low rates of residual (cuticular) transpiration are thought to improve yield potential of wheat under dry conditions, although the linkage is tenuous. The objective of this work was to investigate the association of residual transpiration with water use, WUE, and leaf water status in hexaploid (T. aestivum L.) and tetraploid (T. turgidum L. var. durum) genotypes grown under two watering regimes in two glasshouse experiments. Single plants were grown in 0.1-m × 1-m (0.1-m × 0.5-m in exp. 2 low-stress treatment) PVC tubes filled with soil. The watering regimes consisted of weekly replenishment of water used (low stress), or addition of sufficient water to ensure plant survival (high stress). At anthesis, flag leaf residual transpiration (rate of water loss from excised leaves), stomatal conductance, relative water content (RWC), and osmotic potential (exp. 1 only) were measured. Water use was not correlated with residual transpiration rate in either experiment. Residual transpiration rate did not differ for the two stress treatments in exp. 1, but there were significant (P < 0.01) genotype by stress treatment interactions. Residual transpiration rate was not related to plant water status (leaf RWC or osmotic potential) as had been reported in other studies. Key words: Cuticular transpiration, water use efficiency, Triticum aestivum L., Triticum turgidum L. var. durum

Environmental Physiology of Sorghum. I. Environmental and Genetic Control of Epicuticular Wax Load 1

Crop Science ◽  
1983 ◽  
Vol 23 (3) ◽  
pp. 552-558 ◽  
Author(s):  
W. R. Jordan ◽  
R. L. Monk ◽  
F. R. Miller ◽  
D. T. Rosenow ◽  
L. E. Clark ◽  
...  
Keyword(s):  
Genetic Control ◽  
Epicuticular Wax ◽  
Environmental Physiology ◽  
Wax Load

Environmental Physiology of Sorghum. II. Epicuticular Wax Load and Cuticular Transpiration 1

Crop Science ◽  
1984 ◽  
Vol 24 (6) ◽  
pp. 1168-1173 ◽  
Author(s):  
W. R. Jordan ◽  
P. J. Shouse ◽  
A. Blum ◽  
F. R. Miller ◽  
R. L. Monk
Keyword(s):  
Epicuticular Wax ◽  
Cuticular Transpiration ◽  
Environmental Physiology ◽  
Wax Load

scholarly journals Variation and Relationships among Agronomic Traits in Durum Wheat [Triticum turgidum(L.) Thell. ssp.turgidumconv.durum(Desf.) MacKey] under South Mediterranean Growth Conditions: Stepwise and Path Analyses

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Ali Mansouri ◽  
Bachir Oudjehih ◽  
Abdelkader Benbelkacem ◽  
Zine El Abidine Fellahi ◽  
Hamenna Bouzerzour
Keyword(s):  
Grain Yield ◽  
Durum Wheat ◽  
Harvest Index ◽  
Agronomic Traits ◽  
Triticum Turgidum ◽  
Canopy Temperature ◽  
Growth Conditions ◽  
Path Analyses ◽  
Spike Number ◽  
The One

Relationships among agronomic traits and grain yield were investigated in 56 genotypes of durum wheat (Triticum durumDesf.). The results indicated the presence of sufficient variability nearly for all measured traits. Heritability and expected genetic gain varied among traits. Aboveground biomass, harvest index, and spike number were the most grain yield-influencing traits. Early genotypes showed above-average grain and biological yields, spike number, and lower canopy temperature. Assessed genotypes were clustered into three groups which differed mainly for biological, economical, straw, and grain yields, on the one hand, and plant height, chlorophyll content, and canopy temperature, on the other hand. Selection for direct use from clusters carrying best combinations of yield-related traits and crosses to be made between genotypes belonging to contrasted clusters were suggested to generate more variability. Selection preferentially for spike number, biological yield, harvest index, and canopy temperature to accumulate favorable alleles in the selected entries for future uses is suggested.

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