scholarly journals Genotypic Variation in Ability to Recover from Weed Competition at Early Vegetative Stage in Upland Rice

2010 ◽  
Vol 13 (1) ◽  
pp. 116-120 ◽  
Author(s):  
Kazuki Saito ◽  
Kamla Phanthaboon ◽  
Tatsuhiko Shiraiwa ◽  
Takeshi Horie ◽  
Koichi Futakuchi
Keyword(s):  
Upland Rice ◽  
Genotypic Variation ◽  
Vegetative Stage ◽  
Weed Competition

scholarly journals Drought tolerance in selected aerobic and upland rice varieties is driven by different metabolic and antioxidative responses

Planta ◽  
2021 ◽  
Vol 254 (1) ◽  
Author(s):  
Giovanni Melandri ◽  
Hamada AbdElgawad ◽  
Kristýna Floková ◽  
Diaan C. Jamar ◽  
Han Asard ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Upland Rice ◽  
Vegetative Stage ◽  
Clear Understanding ◽  
Multiple Time ◽  
Rice Varieties ◽  
Antioxidant Power ◽  
Antioxidative Response ◽  
Biomass Loss ◽  
Osmotic Acclimation

Abstract Main conclusions Sugar-mediated osmotic acclimation and a strong antioxidative response reduce drought-induced biomass loss at the vegetative stage in rice. Abstract A clear understanding of the physiological and biochemical adaptations to water limitation in upland and aerobic rice can help to identify the mechanisms underlying their tolerance to low water availability. In this study, three indica rice varieties-IR64 (lowland), Apo (aerobic), and UPL Ri-7 (upland)-, that are characterized by contrasting levels of drought tolerance, were exposed to drought at the vegetative stage. Drought-induced changes in biomass, leaf metabolites and oxidative stress markers/enzyme activities were analyzed in each variety at multiple time points. The two drought-tolerant varieties, Apo and UPL Ri-7 displayed a reduced water use in contrast to the susceptible variety IR64 that displayed high water consumption and consequent strong leaf dehydration upon drought treatment. A sugar-mediated osmotic acclimation in UPL Ri-7 and a strong antioxidative response in Apo were both effective in limiting the drought-induced biomass loss in these two varieties, while biomass loss was high in IR64, also after recovery. A qualitative comparison of these results with the ones of a similar experiment conducted in the field at the reproductive stage showed that only Apo, which also in this stage showed the highest antioxidant power, was able to maintain a stable grain yield under stress. Our results show that different metabolic and antioxidant adaptations confer drought tolerance to aerobic and upland rice varieties in the vegetative stage. The effectiveness of these adaptations differs between developmental stages. Unraveling the genetic control of these mechanisms might be exploited in breeding for new rice varieties adapted to water-limited environments.

Crop/weed competition studies in upland rice

1987 ◽  
Vol 33 (1) ◽  
pp. 19-21 ◽  
Author(s):  
Govindra Singh ◽  
S. R. Yadav ◽  
D. Singh
Keyword(s):  
Upland Rice ◽  
Weed Competition ◽  
Crop Weed Competition

Response of upland rice cultivars to weed competition in the savannas of West Africa

2009 ◽  
Vol 28 (1) ◽  
pp. 90-96 ◽  
Author(s):  
Friday Ekeleme ◽  
Alpha Y. Kamara ◽  
Sylvester O. Oikeh ◽  
Lucky O. Omoigui ◽  
Paul Amaza ◽  
...  
Keyword(s):  
West Africa ◽  
Upland Rice ◽  
Weed Competition ◽  
Rice Cultivars

Genotypic variation in adaptation to soil acidity in local upland rice varieties

2014 ◽  
Vol 13 (3) ◽  
pp. 206-212 ◽  
Author(s):  
Suwannee Laenoi ◽  
Nattinee Phattarakul ◽  
Sansanee Jamjod ◽  
Narit Yimyam ◽  
Bernard Dell ◽  
...  
Keyword(s):  
Root Growth ◽  
Soil Acidity ◽  
Upland Rice ◽  
Genotypic Variation ◽  
Dry Weight ◽  
Pure Line ◽  
Wetland Rice ◽  
Al Tolerance ◽  
Acidic Soils ◽  
Rice Varieties

Local upland rice germplasm is an invaluable resource for farmers who grow rice on acidic soils without flooding that benefits wetland rice. In this study, we evaluated the adaptation to soil acidity in common local upland rice varieties from an area with acidic soil in Thailand. Tolerance to hydrogen and aluminium (Al) toxicity was determined by measuring root growth, plant dry weight and phosphorus (P) uptake in aerated solution culture without the supplementation of Al (0 mg/l) at pH 7 and 4 and with the supplementation of 10, 20 and 30 mg Al/l at pH 4. The root growth of upland rice plants grown from farmers' seed was depressed less by Al than that of common wetland rice varieties. Pure-line genotypes of upland rice varieties were differentiated into several classes of Al tolerance, with frequency distribution of the classes that sometimes differed between the accessions of the same varieties. The effect of Al tolerance on root length was closely correlated with depression by Al in root dry weight and whole-plant P content. A source for adaptation to soil acidity for exploitation in the genetic improvement of aerobic and rainfed rice is clearly found among local upland rice varieties grown on acidic soils. However, the variation in tolerance to soil acidity within and among the seed lots of the same varieties maintained by individual farmers as well as among the varieties needs to be taken into consideration.

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