科研之友
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摘要
This study was to investigate double-purpose (grain as human food and straw as roughage) rice (Oryza sativa L) variety selection and their morphological traits at harvest. Eight japonica cultivars and one indica cultivar grown in 2011, and nine japonica cultivars and two indica cultivars grown in 2012 were used. At harvest, the grain yielding related traits such as 1000-grain weight and one-panicle weight, and the feeding quality related traits of straw (such as nonstructural carbohydrates (NSC)), crude protein (CP) and acid detergent fiber (AD F) contents and in vitro dry matter digestibility (IVDMD)) were investigated in 2 years from 2011 to 2012. The grain yielding (GY) and straw yielding (SY) of 10 plants, the fermentation quality related traits (pH, lactic acid (LA) and NH3-N concentration) of straw, plant height (PH) and green leaf area per tiller (GLA) at harvest were analyzed in 2012. The top 3rd internodes of stem were used to make free hand sections to visualize the morphological traits of stem. The results indicated that Wuxiangjing 14, Wuyujing 3 and Nanjing 44 had good straw feeding quality (with high NSC content, IVDMD and good fermentation quality such as low pH and NH3-N concentration and high LA concentration) and were suitable for double-purpose use. The good-quality double-purpose rice varieties were of relatively low plant height and large green leaf area per tiller at harvest and were of thick culm diameter and wall thickness, and high-percent parenchyma and low-percent vascular bundle area for the top 3rd internode in stem.
