水稻台農67號疊氮化鈉突變品系穎花分佈型式之研究

Study on Spikelet Distribution Pattern of the Sodium Azide-Induced Mutants of Rice Variety Tainung 67

鄭統隆(Toong-Long Jeng) ； 林素月(Su-Yue Lin) ； 曾東海(Tong-Hai Tseng) ； 王強生(Chang-Sheng Wang)

《中華農學會報》 8卷1期 (2007/02) Pp. 35-50

https://doi.org/10.6730/JAAC.200702_8(1).0003

摘要

本研究以自水稻台農67號疊氮化鈉突變庫篩選所獲得的5個穎花分佈型態之突變品系為材料，以誘變親台農67號為對照品種，進行連續2年4期作之穎花分佈調查。結果發現，無論一次枝梗數、一次枝梗穎花數、二次枝梗數及二次枝梗穎花數之數量等性狀，突變品系均產生不同於誘變親台農67號之穎花分佈型式。一次枝梗數增加或減少最多可達3個；大部分突變品系之一次枝梗穎花數均與台農67號相似，約為5~6粒，但突變品系SA0418部分枝梗可增加至7粒。整體而言，每個突變品系在第一期作（2個年度）之二次枝梗穎花數變化曲線並無明顯變異，但第二期作之穎花分佈明顯異於一期作，且年度間表現不一致。突變品系SA04018之二次枝梗穎花數明顯減少，2001年2期作甚至減少到二次枝梗幾乎無穎花之生產，台農67號之二次枝梗穎花數以中部節位最具優勢，突變品系SA04019於一期作則以中上部節位最具優勢，對穗之乾重累積特性而言，可能為優良之突變性狀。總而言之、水稻穎花分佈會隨年度、期作及誘變處理而改變，疊氫化鈉誘變處理可增加穎花分佈之變異程度及產生優良穎花分佈型態之品系，值得研究利用。

關鍵字

水稻 ； 穎花分布 ； 突變體 ； 疊氮化鈉

並列摘要

Five mutants derived from sodium aside mutagenesis with various spikelet distribution patterns on rice panicle were investigated and compared with its mother parent, TNG67 variety, for four crop seasons. The results have shown that the significant differences were observed in primary rachis-branches number, spikelet number on the primary rachis-branch, number of the secondary rachis-branch and number of spikelet on the secondary rachis-branch as compared with the characteristics of TNG67 variety. Most mutants and TNG67 produce 5~6 spikelets on the primary rachis-branch, but mutant SA0418 produced 7 spikelets on parts of its primary rachis-branch. No distinct difference in spikelet distribution on secondary rachis-branch was observed in the first crop season for two years but it was not stable in the second crop season. Mutant SA0418 produced less spikelets in the secondary rachis-branch as compared with TNG67, and most spikelets were found in the secondary rachis-branch, especially in the secondary crop season of year 2001. In mutant, SA0419, a large number of spikelets distributed in the secondary rachis-branch above the middle nodal in the first crop season providing a good characteristic for dry matter accumulation in rice panicle. In conclusion, spikelets distribution pattern of rice may have variable expressions in different year and crop season, and can also be altered by mutagenesis. Rice mutants with variations in spikelet distribution pattern provide good characteristics for further physiological study as well as variety improvement.

並列關鍵字

Rice ； Spikelet distribution pattern ； Mutant ； Sodium aside