|Title:||甘藷逢機交配集團各連續世代之變異及平均表現之研究||Other Titles:||Studies on the Variation and Mean Performance in Successive Generations of a Randomly Intermating Population of Sweet Potatoes||Authors:||李良
|Issue Date:||3-Dec-1974||Publisher:||農業試驗所||Journal Volume:||23||Journal Issue:||4||Start page/Pages:||255-262||Source:||農業研究||Abstract:||
Thirty-two sweet potato (Ipomoea batatas (L.) Lam.) parents selected from wide sources of unrelated materials and good flowering season were intercrossed at Chiayi Agricultural Experiment Station in 1965. The resulting seed from each parent were bulked in same numbers to generate a randomly intermating sweet potato population for use in the development of improved breeding procedures. The data obtained from the seven successive generations of random intermating were used to observe for flowering and seed setting characteristics and estimates of the mean level performance and the extent of variation.
Both flowering and seed setting were more profuse in each of seven successive generations of open pollination. The rate of flowering plants of seven successive generations was 95.8% to 98.5%. A flowering peak occurred in October to November when 84.8% to 97.8% of the plants bloomed. The total seed production of the seven generations of open-pollination varied from 108,004 to 321,537 seeds. The average number of seeds per plant ranged from 90 to 276 seeds. Based on this observation, it appeared that the procedures for the random intermating sweet potato population was not affected by the flowering and fertility problems.
In general, data in Fig. 1 to 4 indicate that there were a trend toward increase for the variability with change the generations of random intercrossing. The combined data show that a marked increase in mean performance obtained for the intervening generations as compared with the early and late generations. The results indicated that the selection for desirable characteristics imposed on the intervening generations of random intermating were apparently effective.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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