頁籤選單縮合
題名 | 高粱臺中五號低發芽之探討 |
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作者姓名(中文) | 高德錚; 梁純玲; 邱玲瑛; | 書刊名 | 臺中區農業改良場研究彙報 |
卷期 | 11 1985.12[民74.12] |
頁次 | 頁1-16 |
分類號 | 434.155 |
關鍵詞 | 低發芽; 高粱; 臺中五號; |
語文 | 中文(Chinese) |
中文摘要 | 本試驗研究從採種流程來探討高粱台中5號發芽不良之原因,經檢查 民國74年初設置於嘉義一帶之採種田作業後發現導致種子劣變之因素為: 1.種子劣變與種子活力、休眠性、後熟性及穗堆積熱無關。 2.種子單寧含量在糊熟期時最高為0.275%,至枯熟期時已降低0.134%,此與種 子罹病率增至39.4%有關。 3.種穗上粒徑大於4.00公厘之大粒種子,含較高之單寧(0.191%)、罹病率低(29.8%) 及發芽率高(86.5%),但在調製精選後此部分種子量從24.9%降至7.9%,相對地 小粒種子(粒徑在3.35∼2.28公厘)量從11.9%增至23.0%,且發芽率僅54.4%。 4.採收過程使用曳引機及聯合收穫機脫粒是造成種子破裂率從9.4%增至49.0% 而發芽率由87.6%降至59.4%之原因。 進一步地以因果路徑分析法導出之貢獻百分比來估算種子發芽不良之因素 為:(1)因種皮損傷而導致罹病者佔38.59%。(2)因種皮損傷但未罹病者32.38%。 (3)種皮未損傷但罹病者佔15.22%,(4)種皮未損傷且未罹病者佔5.80%及(5)原因 未明者佔8.01%。據此,今後應著手於如何降低種子破裂率及罹病率,才可望提 高高粱台中五號之發芽率。 |
英文摘要 | The germination rate of hybrid sorghum cultivar Taichung No. 5 is usually low in the seed production in Taiwan. The cause of low germinability were regarded to be related with the events of anatomy, physiology and pathology of the seeds. However, all efforts failed to improve its germinability to pass germination test. This study, therefore, emphasized on the measures duving seed harvesting, seed processing, seed drying, seed storge etc. Results were summarized as follows: 1.The low germinability of Taichung No. 5 was uncorrelated with its seed vigor, dormancy, post-ripeness and panicle storing heat. 2.The tannic acid content in the grain of Taichung No. 5 increased to 0.275% at middough stage and down to 0.134% at full-ripen stage, while the pathogenic infection rate of seed was increased to 39.4% at harvest. 3.Taichung No. 5 could be divided into four groups by its seed size. The largest seed percent was 24.9% in individual panicle. This seeds obtained high tannic acid (0.191%), low pathogenic infection rate (29.8%), and best germinability (86.5%). Unfortunately, this part decreased to 7.9% during seed processing so that the germinability was down to 54.4% in average. 4.The seed breakage including damage of testa, endosperm and embryo changed from 9.4% to 49.0%. This breakage was due to mechanical damage by using tractor and combined harvester during de-seeding process. 5.Contribution percentage computed by path analysis was evaluated for the cause of low germinability in Taichung No. 5. It indicated that seed breakage resulted from mechanical damage was the major factor to cause pathogenic infection to induce the low germinability in Taichung No. 5. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。