Morphological and Physiological Responses of Weedy Red Rice (Oryza sativa L.) and Cultivated Rice (O. sativa) to N Supply
| Autor: | Brad Murphy, Nilda R. Burgos, Edward E. Gbur, Vinod K. Shivrain, Marites A. Sales |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | American Journal of Plant Sciences. :569-577 |
| ISSN: | 2158-2750 2158-2742 |
| DOI: | 10.4236/ajps.2011.24068 |
| Popis: | Red rice (Oryza sativa L.), a noxious weed in rice production, competes with cultivated rice for nutrients. Accumulation of more N in red rice than in cultivated rice may be due to a mechanism different from that of cultivated rice. To test this assumption, red rice and cultivated rice were grown in nutrient solution to compare their growth and physiological responses to N supply. Experimental design was a split-plot, where main plot factor was rice type (Stf-3, ‘Wells’); split-plot factor was N treatment [T1 (complete nutrient solution); T2 (–NH4NO3); T3 (+NH4NO3 for 24-h post-N deficiency); and T4 (+NH4NO3 for 48-h post-N deficiency)]. Nitrogen deficiency was defined as N sufficiency index (NSI) < 95%. Height, tiller number, biomass, and root morphology were monitored to determine morphological responses. Stf-3 red rice had significantly greater growth measurements than Wells in terms of shoot and root characteristics. At T4, Stf-3 showed higher increment in root length and surface area than Wells. Shoot tissue concentrations of N and total sugars were measured to determine physiological response in N-deficient and N-supplemented plants. Stf-3 had greater N and sucrose tissue concentrations at N-deficient conditions compared with Wells, implying a stress-adaptive molecular mechanism regulated by N and sucrose availability. |
| Databáze: | OpenAIRE |
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