Effect of brown midrib-3 gene on in-vitro stover digestibility and agronomical traits in silage maize
2005
Miki, K.(National Agricultural Research Center for Hokkaido Region, Sapporo (Japan)) | Sato, H. | Koinuma, K. | Enoki, H.
In order to evaluate the effects of the brown midrib-3 (bm 3) gene in maize (Zea mays L.) on stover digestibility and yield, 24 hybrids, including 12 pairs of bm3-type and its normal counterparts, were investigated. The content of organic cellular content (OCC) of stover in bm3-type hybrids was almost equal to that in normal-type hybrids, and the content of highly digestible fiber (Oa) of stover in bm3-type hybrids was 3.1 points higher than that in normal-type hybrids. Ear and TDN contents in the whole plant of bm3-type hybrids were higher than those of normal-type hybrids. Although the average silking date of bm3-type hybrids was 2 days later than that of normal-type hybrids, the average dry matter yield and average TDN yield of bm3-type hybrids were 0.12 kg.a(-1).day(-1) and 0.06 kg.a(-1).day(-1) lower than those of normal-type hybrids, respectively. However, a few of bm3-type hybrids showed earlier silking dates than their normal counterparts, while a few other bm3-type hybrids showed higher TDN yields than their normal counterparts. The influence of the genotypic background on the rate of lodged plants was greater than that of the bm3 gene. Consequently, while the digestibility of stover was improved by the bm3 gene, silking was delayed and yield was reduced. However, the degree of silking delay and yield reduction by the bm3 gene was varied according to the genotypic background.
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