scholarly journals Foliar diagnosis of crop plants by the heat coagulation. : (1) Experiment with rice plants grown under different nutrient conditions.

1950 ◽  
Vol 19 (1-2) ◽  
pp. 109-111
Author(s):  
T. Nagai ◽  
I. Yamada
Keyword(s):  
Crop Plants ◽  
Rice Plants ◽  
Foliar Diagnosis ◽  
Nutrient Conditions

scholarly journals Studies on Nitrogen Metabolism in Crop Plants : VIII. Occurrence of kinetin-like factor in root exudate of rice plants

1970 ◽  
Vol 39 (3) ◽  
pp. 363-369 ◽  
Author(s):  
Ryuzi YOSHIDA ◽  
Takashi ORITANI ◽  
Arasuke NISHI
Keyword(s):  
Nitrogen Metabolism ◽  
Root Exudate ◽  
Crop Plants ◽  
Rice Plants

scholarly journals β-Sitosterol differentially regulates key metabolites for growth improvement and stress tolerance in rice plants during prolonged UV-B stress

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Raheel Shahzad ◽  
Mohamed Ewas ◽  
Putri Widyanti Harlina ◽  
Shahid Ullah Khan ◽  
Pan Zhenyuan ◽  
...  
Keyword(s):  
Stress Tolerance ◽  
Plant Biomass ◽  
Crop Plants ◽  
Ultraviolet B ◽  
Rice Varieties ◽  
Chlorophyll Pigments ◽  
Rice Plants ◽  
Global Challenge ◽  
Whole Plant

Abstract Background Elevated ultraviolet-B (UV-B) radiation is potentially deleterious to many organisms specifically crop plants and has become a global challenge. Rice is an exceptionally important staple food which is grown worldwide, and many efforts have been done recently to improve rice varieties against UV-B stress. This current study aims to investigate the effects of exogenous application of β-sitosterol (βSito) on growth improvement and tolerance level of rice plants against prolonged UV-B stress. The physiological and metabolic responses were evaluated in rice plants not supplemented with βSito (Nβ) and those supplemented with βSito (Sβ). Results The Nβ and Sβ plants were grown under non-stress (ns) and under prolonged UV-B stress (uvs) conditions and termed as Nβns, Sβns and Nβuvs, Sβuvs, respectively. The application of βSito contributes positively under non-stress and specifically to UV-B stress in terms of improving numerous physiological parameters associated with growth and development such as shoot and root length, RWC, whole plant biomass, chlorophyll pigments, and photosynthetic-related parameters (Pn, Gs, Tr, WUEi, Fv/Fm, and NPQ) in Sβ compared with Nβ plants. Moreover, enhanced oxidative stress tolerance of Sβuvs vs. Nβuvs plants under stress was attributed to low levels of ROS and substantial trigger in activities of antioxidant enzymes (SOD, POD, CAT, and APX). Metabolic analysis was performed using GC-TOFMS, which revealed higher accumulation of several key metabolites including organic acids, sugars, amino acids, and others in Sβuvs vs. Nβuvs plants, which were mainly reduced in Nβ plants under stress vs. non-stress conditions. Conclusion These results provide useful data regarding the important role of βSito on growth maintenance and modulation of several metabolites associated with osmotic and redox adjustments during UV-B stress tolerance in rice plants. Importantly, βSito-regulated plasticity could further be explored specifically in relation to different environmental stresses in other economically useful crop plants.

scholarly journals Metatranscriptomics and small RNA analysis revealed that viral covert coinfection resulted in disease symptoms reminiscent of rice sterility

2020 ◽  
Author(s):  
Shufen Chao ◽  
Haoran Wang ◽  
Qing Yan ◽  
Long Chen ◽  
Guoqing Chen ◽  
...  
Keyword(s):  
Viral Infection ◽  
Small Rna ◽  
Rna Viruses ◽  
Brown Planthopper ◽  
Crop Plants ◽  
Disease Symptoms ◽  
Rice Plants ◽  
Rna Analysis ◽  
Backcross Line ◽  
Covert Infection

Abstract BackgroundViral pathogens are a major threat to stable crop production. The discovery of viral diseases traditionally concerns apparent infection that shows obvious symptoms in crop plants. However, little is known about the covert infection of crop plants by viruses. In this study, we used deep metatranscriptomic sequencing and small RNA analysis to identify covert infection of rice plants by viruses.ResultsOur results showed that introgression of the dominant brown planthopper (BPH) resistance gene Bph3 into the high-yielding but BPH-susceptible indica variety Ms55 via a backcross strategy significantly enhanced resistance to BPH. However, Bph3-carrying backcross lines infested by BPH exhibited panicle enclosure and failed to produce seed at the mature stage, which are typical characteristics of sterile rice plants. Using a metatranscriptomic analysis, we identified six RNA viruses in backcross line Rby1 and eleven RNA viruses in backcross line Rby2, including eight novel viruses that fell within existing families and orders. Furthermore, our small RNA analysis revealed the biogenesis of viral small interfering RNAs that represented active virus infection in rice plants.ConclusionBph3-carrying backcross rice lines are resistant to BPH but are susceptible to viral infection. We identified viral covert coinfection in sterile rice plants by deep metatranscriptomic sequencing and small RNA analysis. Our results suggested that covert coinfection of rice plants by RNA viruses resulted in disease symptoms reminiscent of rice sterility. To develop rice varieties resistant to BPH, it is necessary to introgress genes resistant to not only BPH but also viral infection.

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