• Title/Summary/Keyword: plant development

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Carbohydrate, Amino Acid and Phenolic Contents of Rice Leaves in Relation to Adult-Plant Resistance to Leaf Blast (벼 잎의 탄수화물, 아미노산, 페놀화합물 함량과 잎 도열병에 대한 성체식물 저항성과의 관계)

  • Hwang Byung Kook;Kim Ki Deok
    • Korean Journal Plant Pathology
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    • v.3 no.2
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    • pp.93-99
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    • 1987

  • Six rice cultivars showing various types of resistance or susceptibility to Pyricularia oryzae in the field were used to study the relationship between susceptibility and contents of carbohydrates, amino acids and phenolics at different plant maturities and leaf ages under controlled environmental conditions. No consistent differences between the susceptible cultivars and adult-plant-resistant cultivars were found in terms of the contents of individual carbohydrates, total amino acids and phenolics in rice leaves throughout the plant development. Only the adult-plant-resistant cultivar Dobong had lower contents of inositol throughout the plant development than the other cultivars. The amounts of sucrose, inositol, glucose, and fructose increased in all tested cultivars at eight leaf stage than those at five leaf stage, but slightly decreased at twelve leaf stage. In contrast, total amino acids and phenolics gradually decreased during plant development. With increasing age of rice leaves, the amounts of total soluble amino acids and phenolics gradually increased in healthy fifth leaf tissues, although there were no significant differences between the cultivars. In particular, a high level of phenolics existed in old fifth leaves of the cultivar Dobong. These results suggest that increased resistance to blast of matured rice plants and old leaves may be the two different phenomina derived from the physiological changes occurring during plant development and leaf senescence, probably functioning differently in P. oryzae development.

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Effect of Fertilizer Levels on Growth Characters, Dry Matter Yield and Nutrient Quality of Forage Rape in Spring Sowing

  • Kwon, Byung-Sun;Shin, Jeong-Sik;Shin, Dong-Young;Hyun, Kyu-Hwan;Park, Hee-Jin;Sin, Jong-Sup;Seong-Kyu
    • Plant Resources
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    • v.6 no.2
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    • pp.102-107
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    • 2003

  • To find out the optimum fertilizer level for high yielding variety, Velox, experiment was conducted with 15 compositions of fertilizer levels at the experiment field of forage crop in Sunchon National University from Mar. 2000 to Aug. 2000. The effects of nitrogen fertilizer on plant growth were significant but increasing rate of application in potassium and phosphate fertilizers above 6 kg/a had negligible effects on plant growth. The optimum nitrogen application level of fertilizers turned out to be 16-6-6 kg/l0a of N-P$_2$O$_{5}$-K$_{5}$O. Content of crude protein was highest and that of crude fiber such as NDF, ADF, cellulose and lignin were lowest at this rate of fertilizer application. Furthermore, IVDMD was high and dry matter yield were highest at the optimum raterate

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