Quantitative Analysis of Respiration in The Seedling Growth of Summer Forage Crops : II. Maintenance respiration and growth respiration in the seedling growth

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  • 夏型飼料作物の初期生育期における呼吸の定量的解析 : II.幼植物の維持呼吸と生長呼吸について
  • 夏型飼料作物の初期生育期における呼吸の定量的解析-2-幼植物の維持呼吸と生長呼吸について
  • ナツガタ シリョウ サクモツ ノ ショキ セイイクキ ニ オケル コキュウ ノ

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Abstract

In order to clarify the specific differences in growth efficiency (GE) in summer forage crops, sorghum, green panic, Rhodesgrass, African millet and some comparative crops were investigated both in the dark and illuminated conditions. The results obtained are summarized as follows; 1. Relationship between dark respiration rate and relative growth rate (RGR) of seeding (excluding endosperm and scutellum) was expressed by the linear equation in respective species. According to the method of HESKETH et al (1971), maintenance respeiration rate (M) and growth respiration coefficient (Gr) were estimated by the constant and the coefficient of the linear equation, respectively. 2. Temperature had a direct effect upon the maintenance respiration rate (M) of seeding, and the specific differences in the value of M were found. Generally, species of which seeds were light in weight had higher value of M. Rhodesgrass had the highest value of M. 3. Temperature had no effect on the growth respiration coefficient (Gr), and no specific differences were found in the value of Gr. The mean value of Gr at 25°C was 0.224, and estimated value of transformation factor [K=1/(1+Gr] was 0.82. 4. Relationship among growth efficient (GE), transformation factor (K), maintenance respiration rate (M) and relative growth rate (RGR) was expressed by the following reciprocal equation. 1/GE=1/K+M/RGR It was recognized from these results mentioned above that the specific differences in the value of GE (previous report) were found on the differences in M/RGR (MGR: Maintenance respiration-Growth Ratio). 5. On the assumption that the value of K is 0.8, the value of MGR can be calculated numerically from the value of GE in respective species. The specific differences in MGR among summer forage crops were observed, too. And it was recognized that the value of MGR of African millet was lower than that of others.

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