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題 名 | 甘藷收穫指數及塊根收量穩定性之研究 |
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作 者 | 李良; 廖嘉信; 羅筱鳳; | 書刊名 | 中華農學會報 |
卷 期 | 154 1991.06[民80.06] |
頁 次 | 頁3-13 |
分類號 | 434.319 |
關鍵詞 | 甘藷; 收量; 收穫指數; 塊根; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究為探討甘藷收穫指數及塊根乾物收量,在不同環境下,品系與環境交感效應之大小,及其穩定性。以及在變動的環境下,收穫指數與塊根乾物收量及總乾物收量等之關係。採用甘藷10個品系(種),在本省南部地區進行兩年有重複的田間試驗,1989年有6個地點及1990年有5個地點,即以兩年11個環境的試驗資料,作為分析研究。穩定性測定,係以線性反應(□)及線性反應離差(□)兩種穩定性介質的估價,作為測定穩定性介值,及以□=0及□=1,作為測驗穩定性的擬說。 綜合變方分析結果指出,甘藷收穫指數和塊根乾物收量之環境間,品系間的差異及品系與環境交感作用均為極顯著。因為品系與環境交感作用有明顯的存在,表示品系間之收穫指數和塊根乾物收量,因環境不同而表現有不同的反應。 據穩定性測定結果,品系中具有最高之收穫指數及最高的塊根乾物收量,均表現為不穩定。然在本研究之10個甘藷品系中,若干品系之收穫指數和塊根乾物收量仍有分佈於平均穩定性的範圍,且其收穫指數及塊根乾物收量均表現高於11個環境平均值。此表示選拔高收穫指數及高塊根乾物收量的品系,其穩定性未必一定低。 由相關分析結果得知,在不同的環境下,甘藷收穫指數與塊根乾物收量間之相關為顯著正值(r=0.732*),表示收穫指數高的品系,其對應之塊根乾物收量高,且其在變動的環境下,所表現情形尚為一致。本研究11個環境收穫指數之變異係數變域自3.99-15.35%及塊根乾物收量之變異係數變域自21.11-38.39%之間。而在兩個生育期中,品重內單株間收穫指數之變異性,亦較快跟乾物收量小。此表示,因收穫指數係為一個比率,在變動環境下,可能比塊根乾物收量為較小。因此可知,在本省南部地區,由收穫指數作為間接選拔高塊乾物收量的指標。 |
英文摘要 | The purpose of this investigation was to determine phenotype x environment interactions and stability of harvest index (Hl) and root dry yield, and the effect of environments on association of Hl with root dry yield and total dry yield in sweet potatoes. The 10 sweet potato genotypes were grown in replicated tests at six locations in 1989 and five locations in 1990 in southern Taiwan for the use of this study. Two stability parameters were obtained as linear response (â) of an entry mean on the average of all entries in each environment and deviation from the linear response (□), and stability was tested with hypotheses â=0 and □=1. In combined analyses over environments, there were highly significant differences among environments, genotypes and genotype x environment interaction effects for Hl and root dry yield. The significant genotype x environment interaction indicated that the Hl and root dry yield of genotypes responded differently, relative to each other, to a change in environments. Based on the estimates of the two stability parameters, none of the highest root dry yield and the highest Hl genotypes appeared to be stable. However, for the 10 sweet potato genotypes reported herein, several genotypes were still distributed in the average stability regions of the two traits. Also, they had above average Hl and root dry yield in all 11 environments. This indicated that breeding for both high Hl and root dry yield does not necessarily result in low stability. Pairwise correlation coefficient across 11 environments showed that root dry yield was positive and significant correlated with Hl (r=0.732*), indicating that high in Hl genotypes relative to high in respective root dry yield were consistent across the environments. The coefficient of variation of the 11 environments used in this study ranged from 3.99 to 15.35% and 21.11 to 38.39% for Hl and root dry yield, respectively. Moreover, the variation in the Hl among individual plants within cultivars was small as compared to the root dry yield at two growth stages. These indicated that since Hl is a ratio, it might be influenced to a lesser extent than root dry yield by diverse environmental conditions. Hence, it seems to suggest that indirect selection for high root dry yield through Hl as a criterion may be effective in the southern part of Taiwan. |
本系統中英文摘要資訊取自各篇刊載內容。