Can We Improve the Salinity Tolerance of Genotypes of Taxodium by Using Varietal and Hybrid Crosses?

Zhou, Lijing; Creech, David; Krauss, Ken W.; Yin, Yongguang; Kulhavy, David

doi:10.21273/hortsci.45.12.1773

Cited by 10 publications

(11 citation statements)

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“…Croom (pondcypress-PC) (Adams et al, 2012;Creech et al, 2011;Denny and Arnold, 2007). For the purpose of this study, we have accepted the nomenclature that combines all Taxodium associates into one species with three botanical varieties (Zhou et al, 2010). In China, 'Zhongshanshan' is an accepted term that describes the range of hybrids created by crosses between BC, MC, and PC.…”

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Physiological Acclimation of Taxodium Hybrid ‘Zhongshanshan 118’ Plants to Short-term Drought Stress and Recovery

Shi

Yin

Wang

et al. 2016

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The physiological acclimation of Taxodium hybrid ‘zhongshanshan 118’ (T.118) plants to a progressive drought stress and drought-stressed to recovery treatment (DS-R) was investigated in this study. Plants of control (C) treatment were watered daily throughout the experiment. Results indicated that water deficit reduced stomatal conductance (gS) to improve water use efficiency (WUE) and, as a consequence, net photosynthetic rate (Pn), transpiration rate (Tr), and intercellular CO2 concentration (Ci) were also decreased in DS-R T.118 plants compared with C plants. These reductions became more significant with decreasing soil water availability. Correlation analysis showed gS was positively correlated (P < 0.01) with the soil water content as well as leaf relative water content (RWC). There was a tendency to accumulate proline, malondialdehyde (MDA), antioxidases, and membrane electrolyte leakage as stress intensity increased. Moreover, drought stress induced significant (P < 0.05) decline in total chlorophyll contents (Chlt) and increase of nonphotochemical quenching (NPQ) on day 8 as a photo-protective mechanism. Cluster analysis distinguished the adaption of T.118 plants to water deficit in two ways. First, photosynthesis was related to thermal dissipation, and second antioxidation was related to morphology and osmosis. Furthermore, tested parameters showed a reversed tendency and restored equivalently to C levels after 9 days of rewatering. These findings suggest that T.118 plants demonstrated considerable tolerance to short-term drought stress and recovery due to a high degree of plasticity in physiological acclimation.

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Physiological Acclimation of Taxodium Hybrid ‘Zhongshanshan 118’ Plants to Short-term Drought Stress and Recovery

Shi

Yin

Wang

et al. 2016

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“…Although a few horticultural crops are moderate or true halophytes, e.g., tomato (Solanaceae), celery (Apiaceae), olive (Oleaceae), date palm (Arecaceae), asparagus (Liliaceae), and beet (Chenopodiaceae), most are sensitive, and some are very sensitive (glycophytes, nonhalophytes), e.g., pea, bean, chickpea, onion, citrus, and peach and related stone fruits. Unfortunately, although there are numerous comparisons of salt injury among ornamentals, only a little information is available on variation within species or their physiology when stressed (Kotuby-Amacher et al, 2000;Niu and Cabrera, 2010;Robins et al, 2009;Zhou et al, 2010). The term tolerance here may not be appropriate because glycophytes may use exclusion to some extent and avoidance mechanisms such as reabsorption of Na + from the xylem stream and its recirculation down to the roots.…”

Section: Another Complication-few Crop Plants Demonstrate True Salt Tmentioning

confidence: 99%

Options for Developing Salt-tolerant Crops

Loescher¹,

Chan²,

Grumet³

2011

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Soil salinization is an increasing problem worldwide and is often intensified by irrigation. Unfortunately, few new crop cultivars have been developed resistant to saline soils, a consequence, in part, of the complexity of plant responses to salt stress. There are now, however, several non-traditional options to improving salt tolerance as a result of recent progress in better understanding the mechanisms involved. These mechanisms include 1) exclusion of Na+ and Cl– from plant tissues; 2) inclusion of these ions in inert compartments or tissues; and/or 3) some means of osmotic adjustment with solutes that are compatible with the metabolic machinery of the cell. Although there are very few horticultural examples, several lines of evidence indicate that reductions in salt sensitivity through exclusion or inclusion can be achieved by single gene modifications of the ion transport system. Similarly, single genes resulting in osmotic adjustment with solutes compatible with the metabolic machinery of the cell have resulted in significant increases in salt tolerance. Recent advances in sequencing, use of quantitative trait loci, and marker-assisted selection promise to provide other options for improving salt tolerance.

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“…T. mucronatum is native to Mexico, much of Guatemala, the tip of South Texas and New Mexico. It is more tolerant of salt and alkaline soils, but less tolerant of flooding and cercosporidium needle blight (Creech et al 2011 ; Zhou et al 2010 ). T .…”

Section: Introductionmentioning

confidence: 99%

“…It is well known for its fast growth, good form, and strong adaptability to a wide range of soils and climates (Cheng et al 2015 ). It is also relatively pest-free and has a higher tolerance of salt, alkalinity and flooding (Zhou et al 2010 ; Qi et al 2014 ). Thus, it has great ecological and economic potential (Cheng et al 2015 ).…”

Section: Introductionmentioning

confidence: 99%

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Genetic linkage map construction and QTL mapping of seedling height, basal diameter and crown width of Taxodium ‘Zhongshanshan 302’ × T. mucronatum

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Taxodium is a genus renowned for its fast growth, good form and tolerance of flooding, salt, alkalinity, disease and strong winds. In this study, a genetic linkage map was constructed using sequence-related amplified polymorphism (SRAP) and simple sequence repeat (SSR) markers based on an F1 population containing 148 individuals generated from a cross between T. ‘Zhongshanshan 302’ and T. mucronatum. The map has a total length of 976.5 cM, with a mean distance of 7.0 cM between markers, and contains 34 linkage groups with 179 markers (171 SRAPs and 8 SSRs). Quantitative trait loci (QTLs) affecting growth traits, such as seedling height, basal diameter and crown width, were detected based on the constructed linkage map. Four significant QTLs were identified, three of which, namely qtSH-1 for seedling height, qtBD-1 for basal diameter and qtCW-1 for crown width, were located at 2.659 cM of LG7 with logarithm odds values of 3.72, 3.49 and 3.93, respectively, and explained 24.9, 27.0 and 21.7 % of the total variation of the three grown traits, respectively. Another QTL for crown width (qtCW-2) was detected at 1.0 cM on LG13, with a logarithm of odds value of 3.15, and explained 31.7 % of the total variation of crown width. This is the first report on the construction of a genetic linkage map and QTL analysis in Taxodium, laying the groundwork for the construction of a high-density genetic map and QTL mapping in the genus Taxodium.

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Can We Improve the Salinity Tolerance of Genotypes of Taxodium by Using Varietal and Hybrid Crosses?

Cited by 10 publications

References 20 publications

Physiological Acclimation of Taxodium Hybrid ‘Zhongshanshan 118’ Plants to Short-term Drought Stress and Recovery

Physiological Acclimation of Taxodium Hybrid ‘Zhongshanshan 118’ Plants to Short-term Drought Stress and Recovery

Options for Developing Salt-tolerant Crops

Genetic linkage map construction and QTL mapping of seedling height, basal diameter and crown width of Taxodium ‘Zhongshanshan 302’ × T. mucronatum

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