|Title:||水稻臺農67號及其粒重型近同源系之光合物質與氮素供需關係比較||Other Titles:||Status of Dry Matter and Nitrogen Accumulation of Tainung 67 Rice Varieties and Its Near-Isogenic Lines with Higher Grain Weight||Authors:||張富洲
|Issue Date:||1-Jun-1989||Publisher:||農業試驗所||Journal Volume:||38||Journal Issue:||2||Start page/Pages:||157-166||Source:||中華農業研究||Abstract:||
The large-grain variety, Pegonil, medium-grain variety, Tainung 67 and four nearisogenic lines of the latter with higher 1,000-grain-weight (30－36g) were included for field experiments from the 1st crop of 1987 and the 2nd crop of 1988. Status of dry matter and N accumulation at heading and maturity was studied. The purpose was to analyze the differences in contribution parameters of post-heading accumulation to grain yield. Experimental results indicated that grain yield of Tainung 67 was consistently higher than that of Pegonil. Near-isogenic lines showed stability in their grain weight, with grain yield similar to but not higher than that of Tainung 67. Dry matter accumulated after heading of Tainung 67 accounted for 40% of total dry weight at matuity. and the ratio was stable across the four crop season tested. The ratio was lower for Pegonil variety and the near-isogenic lines and was positively correlated to grain yield within crop season. The fact that dry matter produced after heading was lower than grain yield indicated significant retranslocation of photosynthate from vegetative organs to the developing grains. Harvest indexes of all rice materials were above 0.45. However, differences among genotypes existed as BC-6 lines, which were high in dry matter production, were low in partition efficiency in diverting dry matter to the grains. N concentrations in the leaf blade, culm and grain were significantly higher for Pegonil than for Tainung 67. The near-isogenic lines, despits their higher grain-weight, were similar in N concentration to their recurrent parent Tainung 67. Amount of N acquired after heading (Na), and the ratio of Na to total N present at maturity (Nt), were lower for the1st than for the 2nd crop rice, and lower for Pegonil variety. In average, Na accounted for only 40% of the N present in the grain, which suggested the dependency of grain-filling on N accumulated before heading. In general, status of N assimilation and utilization by the four near-isogenic lines with higher grain-weight resembled to that of Tainung 67 with lighter grain-weight. The physiological explanation of the importance of N retranslocation to grain yield remained to be clarified.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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