A method for screening rice plants for salt tolerance

Chowdhury, Md. Arif; Moseki, B.; Bowling, D. J. F.

doi:10.1007/bf00010287

Cited by 11 publications

(5 citation statements)

References 11 publications

(8 reference statements)

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“…S. portulacastrum, a widespread pantropical coastal species, is also a facultative halophyte. This salt-accumulating succulent (Chowdhury et al 1995) can grow in seawater (35 PSU) (Daoud et al 2001) and is tolerant of 50 PSU for up to ten days (Balasubramaniam 2004). The 38.6 ± 2.5 PSU (Fig.…”

Section: Discussionmentioning

confidence: 98%

Seasonal plant water uptake patterns in the saline southeast Everglades ecotone

2007

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The purpose of this study was to determine the seasonal water use patterns of dominant macrophytes coexisting in the coastal Everglades ecotone. We measured the stable isotope signatures in plant xylem water of Rhizophora mangle, Cladium jamaicense, and Sesuvium portulacastrum during the dry (DS) and wet (WS) seasons in the estuarine ecotone along Taylor River in Everglades National Park, FL, USA. Shallow soilwater and deeper groundwater salinity was also measured to extrapolate the salinity encountered by plants at their rooting zone. Average soil water oxygen isotope ratios (delta(18)O) was enriched (4.8 +/- 0.2 per thousand) in the DS relative to the WS (0.0 +/- 0.1 per thousand), but groundwater delta(18)O remained constant between seasons (DS: 2.2 +/- 0.4 per thousand; WS: 2.1 +/- 0.1 per thousand). There was an inversion in interstitial salinity patterns across the soil profile between seasons. In the DS, shallow water was euhaline [i.e., 43 practical salinity units (PSU)] while groundwater was less saline (18 PSU). In the WS, however, shallow water was fresh (i.e., 0 PSU) but groundwater remained brackish (14 PSU). All plants utilized 100% (shallow) freshwater during the WS, but in the DS R. mangle switched to a soil-groundwater mix (delta 55% groundwater) while C. jamaicense and S. portulacastrum continued to use euhaline shallow water. In the DS, based on delta(18)O data, the roots of R. mangle roots were exposed to salinities of 25.4 +/- 1.4 PSU, less saline than either C. jamaicense (39.1 +/- 2.2 PSU) or S. portulacastrum (38.6 +/- 2.5 PSU). Although the salinity tolerance of C. jamaicense is not known, it is unlikely that long-term exposure to high salinity is conducive to the persistence of this freshwater marsh sedge. This study increases our ecological understanding of how water uptake patterns of individual plants can contribute to ecosystem levels changes, not only in the southeast saline Everglades, but also in estuaries in general in response to global sea level rise and human-induced changes in freshwater flows.

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Section: Discussionmentioning

confidence: 98%

Seasonal plant water uptake patterns in the saline southeast Everglades ecotone

2007

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“…Various screening methods have developed to differentiate salinity tolerance in rice at different growth stages under field and greenhouse conditions (IRRI, 1989;Chowdhury & Bowling, 1995). Screening under field conditions is difficult due to stress heterogeneity, significant variation of environmental factors such as temperature, relative humidity, solar radiation and presences of other soil related stresses during the growth period.…”

Section: Introductionmentioning

confidence: 99%

Clustering of Rice (Oryza sativa L.) Varieties Cultivated in Jaffna District of Sri Lanka based on Salt Tolerance during Germination and Seedling Stages

Pradheeban

Suriyagoda

2015

Trop. Agric. Res.

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Twenty three rice (Oryza sativa L.) varieties cultivated in Jaffna district of Sri Lanka were screened for salt tolerance at the germination and early seedling stage using different salinity levels (0, 4, 8, 12, 24 and 45 dSm-1). Cluster analysis was done for germination energy, speed of germination, final germination percentage, root length, root dry weight, plumule length and plumule dry weight. All the tested variables, except sodium concentration in grains, decreased with increased salt levels and had significant differences (p<0.05) among the varieties at EC level of 24 dSm-1. The osmotic effect and toxic effect due to sodium, in combination, played a major role in germination of seeds and early seedling growth due to inhibitory effect in absorption of water. Among the cultivated rice varieties in

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“…To develop high yielding varieties with high salinity tolerance, it is important to have an accurate and precise identification procedure to select best saline tolerant varieties. In the past, different screening methods have been developed to differentiate salinity tolerance rice varieties from susceptible varieties at different growth stages under field and green house conditions Ponnamperuma, 1977;Jenings et al, 1979;IRRI, 1989 andChowdhury andBowling, 1995). As all methods that developed for evaluation of salinity tolerance rice varieties are more time consuming, it will be more beneficial, if a proper laboratory screening procedure is developed to screen rice at seed germination and early growth stages which would save time, labour and high cost of field and greenhouse screening.…”

Section: Introductionmentioning

confidence: 99%

Development of a varietial screening procedure for salt tolerance of rice (Oryza sativa L.) varieties at germination stage

Dissanayake

Wijeratne

2006

J Agric Sciences

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Germination rates were studied using four salt tolerant varieties (At 95-26-4, At 401, Pokkali, Bw 400), one with unknown reaction to salinity (Bg352) and two salt susceptible varieties (Bg 94-1, Bg 350). In the experiment hundred seeds from each of the above varieties were placed in each Petri dish of different salt concentrations (pre test; 0 ds/m, 10 ds/m, 20 ds/m, 30 ds/m and in the experiment; 0 ds/m, 18 ds/m, 21 ds/m, 24 ds/m, 27 ds/m). The pre test was conducted to find out the effective range of salt concentration for the test.There were no significant differences in germination rate among the varieties until 20ds/m salt concentration. Germination rates of all the varieties at 30ds/m salt level were significantly suppressed compared to lower salt level. Salinity tolerant varieties maintained high germination rate up to the level of salt at 21ds/m, whereas salinity susceptible varieties maintained only up to 20ds/m. The results of this study indicated that the rate of seed germination of salinity susceptible varieties were significantly different from salinity tolerant varieties at 21 ds/m salt level. Results emphasized that the salt concentration of 21ds/m can be used as a tool to distinguish between susceptible and resistance rice varieties at the seedling stage by comparing germination rate.

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A method for screening rice plants for salt tolerance

Cited by 11 publications

References 11 publications

Seasonal plant water uptake patterns in the saline southeast Everglades ecotone

Seasonal plant water uptake patterns in the saline southeast Everglades ecotone

Clustering of Rice (Oryza sativa L.) Varieties Cultivated in Jaffna District of Sri Lanka based on Salt Tolerance during Germination and Seedling Stages

Development of a varietial screening procedure for salt tolerance of rice (Oryza sativa L.) varieties at germination stage

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