Screening of Hirsutum Cotton Genotypes for Drought Tolerance under Different Osmotic Potential and Field Capacities

Background and Objectives: Drought occurs more frequently in Northern China with the advent of climate change, which might increase the mortality of tree seedlings after afforestation due to hydraulic failure. Therefore, investigating water relations helps us understand the drought tolerance of tree seedlings. Electrical impedance spectroscopy (EIS) is widely used to assess the responses of plant tissues to stress factors and may potentially reveal the water relations of cells. The aim of this study is to reveal the relationships between EIS and water related parameters, produced by pressure–volume (PV) curves in lacebark pine (Pinus bungeana Zucc.) seedlings reacting to drought stress. Materials and Methods: Four-year-old pot seedlings were divided into three parts (0, 5, and 10 days of drought) before planting, the treated seedlings were then replanted, and finally exposed to post-planting drought treatments with the following soil relative water contents: (i) adequate irrigation (75%–80%), (ii) light drought (55%–60%), (iii) moderate drought (35%–40%), and (iv), severe drought (15%–20%). During the post-planting growth phase, the EIS parameters of needles and shoots, and the parameters of PV curves, were measured coincidently; thus, the correlations between them could be obtained. Results: The extracellular resistance (re) of needles and shoots were substantially reduced after four weeks of severe post-planting drought stress. Meanwhile, the osmotic potential at the turgor-loss point (ψtlp) and the saturation water osmotic potential (ψsat) of shoots decreased after drought stress, indicating an osmotic adjustment in acclimating to drought. The highest correlations were found between the intracellular resistance (ri) of the shoots and ψtlp and ψsat. Conclusions: EIS parameters can be used as a measure of drought tolerance. The change in intracellular resistance is related to the osmotic potential of the cell and cell wall elasticity. Extracellular resistance is a parameter that shows cell membrane damage in response to drought stress in lacebark pine seedlings.

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

Applied Photosynthesis - New Progress ◽

10.5772/62232 ◽

2016 ◽

Cited By ~ 2

Author(s):

Erkin Zakhidov ◽

Sherzod Nematov ◽

Vakhobjon Kuvondikov

Keyword(s):

Chlorophyll Fluorescence ◽

Drought Tolerance ◽

Cotton Genotypes

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Osmotic potential at full turgor: an easily measurable trait to help breeders select for drought tolerance in wheat

Plant Breeding ◽

10.1111/pbr.12367 ◽

2016 ◽

Vol 135 (3) ◽

pp. 279-285 ◽

Cited By ~ 10

Author(s):

Kyle B. Mart ◽

Erik J. Veneklaas ◽

Helen Bramley

Keyword(s):

Drought Tolerance ◽

Osmotic Potential

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

International Journal of Cotton Research and Technology ◽

10.33865/ijcrt.002.01.0372 ◽

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

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Screening cotton genotypes for seedling drought tolerance

Genetics and Molecular Biology ◽

10.1590/s1415-47571998000400023 ◽

1998 ◽

Vol 21 (4) ◽

pp. 545-549 ◽

Cited By ~ 11

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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