scholarly journals Monitoring of the Drought Tolerance of Various Cotton Genotypes Using Chlorophyll Fluorescence

10.5772/62232 ◽  
2016 ◽  
Author(s):  
Erkin Zakhidov ◽  
Sherzod Nematov ◽  
Vakhobjon Kuvondikov
Keyword(s):  
Chlorophyll Fluorescence ◽  
Drought Tolerance ◽  
Cotton Genotypes

COMBINING ABILITY ANALYSIS OF DROUGHT TOLERANCE IN WHEAT OVER DIFFERENT WATER REGIMES

2001 ◽  
Vol 48 (4) ◽  
pp. 353-361 ◽  
Author(s):  
E. Farshadfar ◽  
M. Farshadfar ◽  
J. Sutka
Keyword(s):  
Chlorophyll Fluorescence ◽  
Drought Tolerance ◽  
Grain Yield ◽  
Combining Ability ◽  
Relative Water Content ◽  
Harvest Index ◽  
Environment Interaction ◽  
Combining Ability Analysis ◽  
Rainfed Conditions ◽  
Relative Water

To study the properties of some drought tolerance criteria and  agronomic characters in wheat, an eight-parental diallel cross, excluding reciprocals, was grown in a randomized complete block design with three replications under two different water regimes (irrigated and rainfed) for two years in the College of Agriculture at Razi University, Kermanshah, Iran. High broad-sense heritability estimates were observed for harvest index, grain yield, and earliness. Additive gene action was found to be predominant for grain yield, harvest index, relative water content and chlorophyll fluorescence. The results of combining ability analysis revealed that Plainsman was the best general combiner and Plainsman × Kobomugi was the best specific combination for improving drought tolerance. The pooled analysis of variance for combining ability over rainfed conditions reflected that the GCA × environment interaction was not significant for harvest index and chlorophyll fluorescence, and the SCA × environment interaction was  non-significant for relative water content and relative water loss, indicating that genes controlling osmoregulation and the other physiological traits mentioned are not affected in these varieties by different rainfed conditions and hence show static stability.

scholarly journals Some special features of the water regime and the photosynthetic apparatus activity in Feijoa sellowiana (O. Berg) O. Berg plants under the water stress

2021 ◽  
Vol 38 ◽  
pp. 00117
Author(s):  
Elena Shishkina ◽  
Tatiyna Gubanova ◽  
Valerii Titov
Keyword(s):  
Chlorophyll Fluorescence ◽  
Water Stress ◽  
Drought Tolerance ◽  
Water Content ◽  
Water Regime ◽  
Fluorescence Induction ◽  
Chlorophyll Fluorescence Induction ◽  
Ps Ii ◽  
Water Stress Tolerance ◽  
Leaf Tissues

When assessing the drought tolerance of Feijoa sellowiana cultivars and forms, the total water content in leaf tissues and their waterretaining and regenerative capacity were determined, and the parameters of chlorophyll fluorescence induction were measured at different water content in leaves. Current-year leaves were characterized by a higher sensitivity to drought. According to the complex of water regime parameters and characteristics of the chlorophyll fluorescence induction (CFI), it was found that the cultivar Aromatnaya Fantazia and the form 3/1 are characterized by a relatively high drought tolerance. It has been demonstrated that the common method for assessing plant tolerance by the index of their water-retaining forces, in relation to Feijoa sellowiana genotypes, does not allow determining the critical level of water deficit. It has been found that in the cultivars and forms with low water stress tolerance, with the water loss of 20-25% from the leaf tissues complete hydration, irreversible irregularities in the PS II structures occurred. The most sensitive to the lack of water in the leaves were such parameters as variable fluorescence, rate constants of the photochemical and non-photochemical deactivation of the excitation, as well as the processes of Qa reduction in the reaction centers of PS II.

Investigation into the drought tolerance of broadleaf street trees using chlorophyll fluorescence

2017 ◽  
pp. 427-430 ◽  
Author(s):  
M. Vaz Monteiro ◽  
K.J. Doick ◽  
V. Lawrence ◽  
A. Albertini ◽  
P. Handley
Keyword(s):  
Chlorophyll Fluorescence ◽  
Drought Tolerance ◽  
Street Trees

scholarly journals Evaluation of different cotton varieties against drought tolerance: A comparative analysis

2020 ◽  
Vol 2 (1) ◽  
pp. 47
Author(s):  
Aziz Ullah ◽  
Amir Shakeel ◽  
Hafiz Ghulam Muhu-Din Ahmed ◽  
Muhammad Majid Yar ◽  
Muhammad Ali
Keyword(s):  
Drought Tolerance ◽  
Research Work ◽  
Moisture Regime ◽  
Cotton Production ◽  
Positive Interaction ◽  
Drought Conditions ◽  
Relative Water ◽  
Cotton Genotypes ◽  
Leaf Water Loss ◽  
Morphological And Physiological Traits

The limited water supply for irrigation is a major constraint to cotton production. Morphological and physiological traits provide useful information for drought tolerance. This research work was carried out for the identification of cotton genotypes having better drought tolerance. For this purpose, forty (40) genotypes of upland cotton were studied under two moisture regime, i.e. normal and drought environment in field conditions. The experiment was conducted using split plot design under RCBD arrangement. All the genotypes behaved differently under two moisture levels. The interaction of cotton genotypes with two moisture levels were studied for various traits, i.e. plant height, sympodial branches, seed cotton yield, boll weight, number of bolls per plant, excised leaf water loss and relative water content by using Principle Component Analysis (PCA). Results showed that the genotypes VH-144, IUB-212, MNH-886, VH-295, IR-3701, AA-802, NIAB-111, NS-121, FH-113, and FH-142 are either stable or showing positive interaction with drought conditions for most of the traits under studied. These genotypes can be used in further breeding program for developing varieties suitable for cultivation under drought conditions, whereas; IR-3, CIM-443, FH-1000, MNH-147, S-12 interacted undesirably with drought stress

scholarly journals Screening cotton genotypes for seedling drought tolerance

1998 ◽  
Vol 21 (4) ◽  
pp. 545-549 ◽  
Author(s):  
Julio C. Viglioni Penna ◽  
Laval M. Verhalen ◽  
M.B. Kirkham ◽  
Ronald W. McNew
Keyword(s):  
Drought Tolerance ◽  
Screening Method ◽  
Screening Tests ◽  
High Survival ◽  
Germplasm Collections ◽  
Confirmation Test ◽  
Wide Range ◽  
Cotton Genotypes ◽  
Field Information ◽  
Designs Of Experiments

The objectives of this study were to adapt a screening method previously used to assess seedling drought tolerance in cereals for use in cotton (Gossypium hirsutum L.) and to identify tolerant accessions among a wide range of genotypes. Ninety genotypes were screened in seven growth chamber experiments. Fifteen-day-old seedlings were subjected to four 4-day drought cycles, and plant survival was evaluated after each cycle. Three cycles are probably the minimum required in cotton work. Significant differences (at the 0.05 level or lower) among entries were obtained in four of the seven experiments. A "confirmation test" with entries previously evaluated as "tolerant" (high survival) and "susceptible" (low survival) was run. A number of entries duplicated their earlier performance, but others did not, which indicates the need to reevaluate selections. Germplasms considered tolerant included: `IAC-13-1', `IAC-RM4-SM5', `Minas Sertaneja', `Acala 1517E-1' and `4521'. In general, the technique is simple, though time-consuming, with practical value for screening a large number of genotypes. Results from the screening tests generally agreed with field information. The screening procedure is suitable to select tolerant accessions from among a large number of entries in germplasm collections as a preliminary step in breeding for drought tolerance. This research also demonstrated the need to characterize the internal lack of uniformity in growth chambers to allow for adequate designs of experiments.

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