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題名 | 矮性狼尾草產量與品質之改良 |
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作者 | 成游貴; 陳嘉昇; 吳建福; | 書刊名 | 畜產研究 |
卷期 | 28:4 1995.12[民84.12] |
頁次 | 頁285-294 |
分類號 | 437.113 |
關鍵詞 | 矮性狼尾草; 產量; 品質; Dwarf napiergrass; Forage yield; Quality; |
語文 | 中文(Chinese) |
中文摘要 | 本研究之目的在於利用矮性珍珠粟(Tift 85DB)、矮性狼尾草(Mott)及高莖狼尾草(7262)進行種間雜交與狼尾草種內自然授粉,以瞭解矮性基因對於牧草產量與品質之影響,並選育兼顧品質與產量之品系供推廣。親本Mott自然授粉後裔之株高分離為矮性及高莖品系,而親本7262之自然授粉後裔大多數為高莖品系。Tift 85DB×Mott之雜交族群中,分離出極矮(50公分以下)及矮性之品系,而Tift 85DB×7262之雜交族群大多數為高莖種,由以上結果顯示,親本“Mott”為異質體且含有矮性基因,而矮性基因對於雜交種株高之影響,可能與染色體組間之相亙作用有關。由Mott自然授粉後裔選出之品系7728品質之親本Mott高,產量比Mott及臺畜草一號分別高出8%及38%。7734品質比Mott及臺畜草一號優,且比臺畜草一號產量高約20%。由性狀與產量及品質間之相關分析結果,產量與株高、葉片數及莖徑成正相關。葉╱莖比與株高、酸洗及中洗纖維成負相關,與粗蛋白質成正相關,因此,以葉╱莖比作為選拔高品質之初期指標是可行的。而由珍珠粟及狼尾草而來之矮性基因,主要作用在於縮短莖節,提高葉與莖之比例。由以上結果,利用矮性基因於狼尾草之改良,可選育兼顧產量與品質之品系。 |
英文摘要 | Hybrids obtained from Tift 85DB (dwarf pearl millet) × "Mott" (dwarf napiergrass) and Tift 85DB×7262 (new strains of tall napiergrass), and open pollinated progenies of "Mott" and 7262 were used to investigate the effects of dwarf genes on forage yield and chemical composition. Progenies from open-pollinated "Mott" segregated from dwarf and tall plants and most of progenies from open-pollinated 7262 were tall plants. Hybrids from Tift 85DB × "Mott" segregated from dwarf and extreme dwarf plants, but most of hybrids from Tift 85DB × 7262 were tall plants. It showed that "Mott" was heterozygote ans has dwarf genes. Intergenomic dominance and/or epistasis might be involved in the inheritance of tallness in the Pennisetum interspecific hybrids. In the yield trial, strain 7728 selected from "Mott" open pollinated progenies was better than "Mott" in quality, and also better than "Mott" and TLG1 in yield by 8% and 38%, respectively. Strain 7734 was better than "Mott" and TLG1 in quality, and also 20% more yield than TLG1. There were positive correlation between forage yield with plant height, leaves and stem diameter. In quality, there were positive correlation between leaf/stem ratio with crude protein and negative correlation between leaf/stem ratio with plant height, ADF and NDF. Therefore, it was reasonable to use the leaf to stem ratio as the primary selection index for quality. The dwarf genes from pearl millet or/and napiergrass shortened stem internodes and increase the leaf to stem ratio. From the results, it showed that the improvement for both forage yield and quality at same time were possible by using dwarfing genes. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。