Variation in Drought Tolerance in Eucalyptus viminalis Labill

1974 ◽  
Vol 22 (3) ◽  
pp. 489 ◽  
Author(s):  
PY Ladiges
Keyword(s):  
Drought Tolerance ◽  
Drought Resistance ◽  
Moisture Stress ◽  
Habitat Changes ◽  
Eucalyptus Viminalis ◽  
Moist Habitat ◽  
Physiological Resistance ◽  
Selection For ◽  
Granite Soil ◽  
Two Populations

Six-month-old seedlings of two low rainfall populations of Eucalyptus viminalis showed greater resistance to desiccation and were less damaged by sustained drought than seedlings from two high rainfall populations. The more resistant seedlings did not simply avoid drought by quickly closing stomata, but were capable of maintaining relatively high rates of transpiration under moderate moisture stress. The two populations from moist habitats wilted at a higher relative turgidity of leaves than did the populations from the drier habitats. Furthermore, for populations from one dry habitat and one moist habitat, changes in relative turgidity in relation to water potential of leaves during drying were not significantly different. It is suggested that the greater tolerance of the low rainfall populations to drought is related to physiological resistance of the protoplasm to desiccation. Some differences in drought resistance were also noted between the two low rainfall populations. Young seedlings (3 months old) from a population on a deep basalt-derived soil were less resistant than young seedlings from a neighbouring population on a shallower granite soil. It is suggested that the selection for drought tolerance at the granite site has been more severe than at the basalt site.

scholarly journals Genetic Basis of Drought Resistance at Reproductive Stage in Rice: Separation of Drought Tolerance From Drought Avoidance

Genetics ◽  
2005 ◽  
Vol 172 (2) ◽  
pp. 1213-1228 ◽  
Author(s):  
Bing Yue ◽  
Weiya Xue ◽  
Lizhong Xiong ◽  
Xinqiao Yu ◽  
Lijun Luo ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Drought Resistance ◽  
Genetic Basis ◽  
Reproductive Stage ◽  
Drought Avoidance

scholarly journals Selection for Ethanol Tolerance in Two Populations of Drosophila Melanogaster Segregating Alcohol Dehydrogenase Allozymes

1979 ◽  
Vol 32 (3) ◽  
pp. 387 ◽  
Author(s):  
John B Gibson ◽  
NigeI Lewis ◽  
MichaeI Adena ◽  
Susan R Wilson
Keyword(s):  
Drosophila Melanogaster ◽  
Alcohol Dehydrogenase ◽  
Ethanol Tolerance ◽  
Selection For ◽  
Two Populations

Selection for ethanol tolerance was equally successful in two populations of D. melanogaster in both of which the frequency of AdhF was 0�5 at the start of the experiment.

scholarly journals The leaf anatomical features of some Rosa species in relation to their drought resistance

2016 ◽  
Vol 71 (1) ◽  
pp. 16-19 ◽  
Author(s):  
N. Nuzhyna ◽  
O. Tkachuk
Keyword(s):  
Drought Tolerance ◽  
Drought Resistance ◽  
Leaf Anatomy ◽  
Anatomical Structure ◽  
Anatomical Features ◽  
Rosa Species

The leaf anatomy of species of the genus Rosa: R. donetzica, R. kokanica, R. roxburhii, R. rugosa, R. spinosissima was studied. It was found that the plants R. donetzica and R. kokanica have very low drought tolerance by the anatomical structure. The plants of species R. rugosin and R. spinosissima have most xeromorphy features.

scholarly journals Germination Patterns in Seeds Produced in Apical and Basal Fruits of Two Thlaspi arvense Populations

Agronomy ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 756
Author(s):  
Eva Edo-Tena ◽  
Russ W. Gesch ◽  
Aritz Royo-Esnal
Keyword(s):  
Germination Percentage ◽  
Temperate Climate ◽  
Oilseed Crop ◽  
Seed Selection ◽  
Thlaspi Arvense ◽  
Production Site ◽  
Field Pennycress ◽  
Selection For ◽  
The One ◽  
Two Populations

The aim of the present work is to study possible differences in the germination behavior of apical and basal seeds (produced in the upper and lower fruits of the infruitescence), of two populations of field pennycress (Thlaspi arvense), both produced in a Mediterranean and a continental temperate climate. The results showed that among the three studied factors (population, seed type, production site), only the production site was relevant for the total germination, germinating those produced in Morris in a greater amount than those produced in Lleida. Germination models could be applied only to seeds produced at Morris (>10% germination), and despite the lack of differences in the total germination percentage, germination rates (speed—b parameter—and time to 50% germination—G50) differed between population and seed types—apical seeds from the Spanish population germinated faster (lower b parameter) than the rest, while apical seeds of both populations germinated faster than the corresponding basal seeds (lower G50). The results show, on the one hand, the importance of the seed production site if this species was considered as a commercial oilseed crop and, on the other hand, differences that will help seed selection for seed germination and establishment improvement of pennycress.

scholarly journals QTL detection and putative candidate gene prediction for leaf rolling under moisture stress condition in wheat

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Aakriti Verma ◽  
M. Niranjana ◽  
S. K. Jha ◽  
Niharika Mallick ◽  
Priyanka Agarwal ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Candidate Gene ◽  
Linkage Map ◽  
Ssr Markers ◽  
Stress Condition ◽  
Recombinant Inbred Lines ◽  
Snp Array ◽  
Moisture Stress ◽  
Potential Candidate ◽  
Leaf Rolling

Abstract Leaf rolling is an important mechanism to mitigate the effects of moisture stress in several plant species. In the present study, a set of 92 wheat recombinant inbred lines derived from the cross between NI5439 × HD2012 were used to identify QTLs associated with leaf rolling under moisture stress condition. Linkage map was constructed using Axiom 35 K Breeder’s SNP Array and microsatellite (SSR) markers. A linkage map with 3661 markers comprising 3589 SNP and 72 SSR markers spanning 22,275.01 cM in length across 21 wheat chromosomes was constructed. QTL analysis for leaf rolling trait under moisture stress condition revealed 12 QTLs on chromosomes 1B, 2A, 2B, 2D, 3A, 4A, 4B, 5D, and 6B. A stable QTL Qlr.nhv-5D.2 was identified on 5D chromosome flanked by SNP marker interval AX-94892575–AX-95124447 (5D:338665301–5D:410952987). Genetic and physical map integration in the confidence intervals of Qlr.nhv-5D.2 revealed 14 putative candidate genes for drought tolerance which was narrowed down to six genes based on in-silico analysis. Comparative study of leaf rolling genes in rice viz., NRL1, OsZHD1, Roc5, and OsHB3 on wheat genome revealed five genes on chromosome 5D. Out of the identified genes, TraesCS5D02G253100 falls exactly in the QTL Qlr.nhv-5D.2 interval and showed 96.9% identity with OsZHD1. Two genes similar to OsHB3 viz. TraesCS5D02G052300 and TraesCS5D02G385300 exhibiting 85.6% and 91.8% identity; one gene TraesCS5D02G320600 having 83.9% identity with Roc5 gene; and one gene TraesCS5D02G102600 showing 100% identity with NRL1 gene were also identified, however, these genes are located outside Qlr.nhv-5D.2 interval. Hence, TraesCS5D02G253100 could be the best potential candidate gene for leaf rolling and can be utilized for improving drought tolerance in wheat.

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