Effect of bicarbonate on root growth and accumulation of organic acids in Zn-inefficient and Zn-efficient rice cultivars (Oryza sativa L.)

In addition to characterising root architecture, evaluating root water uptake ability is important for understanding drought response. A series of three lysimeter studies were conducted using the OryzaSNP panel, which consists of 20 diverse rice (Oryza sativa L.) genotypes. Large genotypic differences in drought response were observed in this genotype panel in terms of plant growth and water uptake. Total water uptake and daily water uptake rates in the drought-stress treatment were correlated with root length density, especially at depths below 30 cm. Patterns of water uptake among genotypes remained consistent throughout the stress treatments: genotypes that initially extracted more water were the same genotypes that extracted more water at the end of the study. These results suggest that response to drought by deep root growth, rather than a conservative soil water pattern, seems to be important for lowland rice. Genotypes in the O. sativa type aus group showed some of the greatest water uptake and root growth values. Since the OryzaSNP panel has been genotyped in detail with SNP markers, we expect that these results will be useful for understanding the genetics of rice root growth and function for water uptake in response to drought.

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Análisis Prospectivo de la Detección Hiperespectral de Cultivos de Arroz (Oryza Sativa L.)

KnE Engineering ◽

10.18502/keg.v3i1.1414 ◽

2018 ◽

Vol 3 (1) ◽

pp. 69

Author(s):

Jorge Serrano ◽

José Fábrega ◽

Evelyn Quirós ◽

Javier Sánchez- Galán ◽

José Ulises Jiménez

Keyword(s):

Principal Component Analysis ◽

Oryza Sativa ◽

Oryza Sativa L ◽

Principal Component ◽

Field Measurements ◽

Spectral Signature ◽

Prospective Analysis ◽

Rice Cultivars ◽

Crop Varieties ◽

Nm Range

The objective of this work is to perform a prospective analysis of the wavelengths that can be used to recognize a rice crop due to its phenological status and variety. For this purpose, field measurements of spectral signature in the 350 nm -1049 nm range were employed. The rice cultivars FCA 616FL and IDIAP 54-05 were used. The study site was located in the Juan Hombrón area in the Coclé province, Panama. A principal component analysis (PCA) was carried out, which resulted in the lengths 728.16, 677.89 and 785.48 nm let phenological differentiation within the cultivar FCA 616FL and IDIAP 54-05, the lengths 729.72, 814.58 and 666.81 nm let distinguish between crop varieties FCA 616FL and IDIAP 54-05 in vegetative phase.Keywords: Rice, reflectance, hyperspectral signature, phonological state.

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Callus Induction and Plantlet Regeneration Ability of Selected Sri Lankan Traditional Rice Cultivars (Oryza Sativa L.) in Caryopses Culture

Tropical Agricultural Research and Extension ◽

10.4038/tare.v15i2.5244 ◽

2013 ◽

Vol 15 (2) ◽

pp. 15

Author(s):

N Dahanayake ◽

AL Ranawake

Keyword(s):

Oryza Sativa ◽

Callus Induction ◽

Oryza Sativa L ◽

Plantlet Regeneration ◽

Regeneration Ability ◽

Sri Lankan ◽

Rice Cultivars ◽

Traditional Rice

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Modulation of ascorbate-glutathione cycle by selenate and sulphate treatments in the seedlings of two rice (Oryza sativa L.) cultivars

Plant Science Today ◽

10.14719/pst.2020.7.3.746 ◽

2020 ◽

Vol 7 (3) ◽

Author(s):

Debarati Das ◽

Paulin Seal ◽

Sabarni Biswas ◽

Asok K Biswas

Keyword(s):

Oryza Sativa ◽

Growth And Development ◽

Elevated Level ◽

Oryza Sativa L ◽

Ascorbate Oxidase ◽

Rice Cultivars ◽

Rice Seedlings ◽

Thiol Metabolism ◽

Regulatory Enzymes ◽

Glutathione Cycle

The trace element Selenium (Se) has a dual role in the growth and metabolism of plants. Low concentration of selenium (2 ?M selenate) promotes growth and counteracts the detrimental effects of abiotic stress as opposed to higher levels (?10 ?M) where it acts as a pro-oxidant. We focused on both individual and interactive influence of selenate and sulphate on thiol metabolism in seedlings of rice cultivars, satabdi and khitish. Inhibition of ascorbate contents by about 17% on an average, in the test seedlings treated with Se correlated with increased activities of ascorbate peroxidase and ascorbate oxidase in the cultivars. The glutathione levels also increased significantly, on an average by about 102% in roots and 74% in shoots of cv. satabdi compared to a rise, by about 49% in roots and 56% in shoots of cv. khitish. The elevated level of glutathione coincided with the stimulatory influence of Se on its regulatory enzymes. Concomitantly the levels of ?-tocopherol and phytochelatins were also induced in both the test cultivars. Increase in ?-tocopherol activity reached a maximum by about 47% in roots and 80% in shoots of cv. satabdi whereas it increased by about 36% in roots and about 64% in shoots of cv. khitish. Substantive increase in the levels of PC4 followed by PC2 and PC3 was also noted. The effects were found to be less conspicuous in shoots than in roots. Rice seedlings exposed to combined Se and 10mM sulphate treatments showed improved growth and development as a result of better thiol metabolism due to amelioration of the adverse effects caused by selenium alone on all the parameters tested.

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