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Phenotypic indicators of NaCl tolerance levels in rice seedlings: variations in development and leaf anatomy Shantanu Devidas

100%

Wankhade S. D., Bahaji A., Mateu-Andres I., Cornejo M. J.

Acta Physiologiae Plantarum

2010

tom 32

nr 6

The aim of this research is the early identification of distinctive responses to NaCl in rice cultivars that would indicate further stress-related effects in mature plants. For this purpose, we analysed some developmental and anatomical features in control and NaCl-stressed seedlings of two Japonica rice cultivars (Bomba and Bahia). Responses ascribed to osmotic stress were differentiated from those related to the ionic component of salinity by using in parallel a non-penetrating osmoticum (sorbitol). The general patterns of reduction in growth and variations in anatomical features of second leaf sections were similar in both cultivars. The main difference between them was the intensity of the response as a function of the stress agent. In general, the effect of NaCl was significantly stronger than that of sorbitol in cv. Bomba, whereas in cv. Bahia the effects of both stress agents were comparable. In this regard, the size of epidermal and bulliform cells as well as dimensions related to the vascular system, including xylem vessels, increased significantly in NaCl-stressed cv. Bomba leaves. This enlargement of xylem vessels agrees with the observed decrease in the rate of eosin transport and appears to be a distinctive anatomical indicator of NaCl sensitivity. The further impact of salinity on grain yield was proved to be stronger in cv. Bomba plants than in those of cv. Bahia.

Morpho-physiological variations in response to NaCl stress during vegetative and reproductive development of rice

100%

Wankhade S. D., Cornejo M.-J., Mateu-Andres I., Sanz A.

Acta Physiologiae Plantarum

2013

tom 35

nr 02

The complex nature of plant resistance to adverse environmental conditions, such as salinity and drought requires a better understanding of the stress-induced changes that may be involved in tolerance mechanisms. Here we investigate stress-related morpho-physiological effects during vegetative and reproductive growth in two Japonica rice cultivars (Bomba and Bahia) exposed to a range of NaCl concentrations from the seedling stage. The stress-related detrimental effects were observed either earlier or to a higher extent in cv. Bomba than in Bahia. Damages to the photosynthetic apparatus were related to loss of chlorophyll (Chl) and to a decrease of the maximum potential efficiency of PSII (Fv/Fm), affecting negatively net CO2 assimilation rate (PN). Stress-related leaf anatomical alterations were analysed during the vegetative and reproductive stages. The size of bulliform cells as well as dimensions related to the vascular system increased under mild stress but decreased in the longer term or under higher stress level. The pattern of the anatomical alterations observed at the reproductive stage under 20 mM NaCl was reflected in poor panicle development and yield loss, with effects more pronounced in cv. Bomba than in Bahia. In summary, our results show that some physiological and, particularly, leaf anatomical responses induced by NaCl stress are distinctive indicators of sensitivity to salt stress in rice cultivars.

Ograniczanie wyników

2 Acta Physiologiae Plantarum

2 Mateu-Andres I.

2 Wankhade S. D.

1 Bahaji A.

1 Cornejo M. J.

1 Cornejo M.-J.

1 Sanz A.

1 2013

1 2010

Wyniki wyszukiwania

Phenotypic indicators of NaCl tolerance levels in rice seedlings: variations in development and leaf anatomy Shantanu Devidas

Morpho-physiological variations in response to NaCl stress during vegetative and reproductive development of rice