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標題: 香杉開放式授粉家系的幼年期與成熟期性狀的相關性
Juvenile-Mature Correlation for Early Selection of Open-Pollinated Families of China Fir (Cunninghamia lanceolata (Lamb.) var. konishii)
作者: 顏伃君
Yen, Yu-Chun
關鍵字: 香杉;China-fir;種子園;後裔試驗;早期選拔;年齡間相關性;seed orchard;progeny test;early selection;age-age correlation
出版社: 國際農學研究所
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本研究分析了兩個香杉的後裔檢定族群在不同年齡的性狀相關性。這兩個族群來自同一個開放式授粉的香杉無性系種子園,種子園建立於1972年,位於台灣中部山區,園內一共有25個家系。年齡較大 (25年生)的後裔檢定族群簡稱為A,A族群生長在野外,共量測到232棵樹,由種子園中當年所採集到的18個開花結實家系組成。另一族群簡稱為B,生長於溫室環境,總共約有15,000棵小苗,由採自種子園中完整的25個家系組成,本研究使用其中1,500棵為樣本。由A族群所量測到的性狀包含有2年、6年及25年生的樹高、胸高直徑、地際直徑、材積及年平均生長高度,另外於27年量測了木材密度。B族群則是量測了5個月、7個月、9個月及13個月的根徑、根長、地下部及地上部各自的鮮重與乾重,根梢部的重量比、苗木的健壯指數及狄克森品質指數。調查結果顯示兩個族群在家系間都有顯著的遺傳變異,多數性狀的個體遺傳率都相當高(分別是h2=0.35~0.62 及 0.25~1)。本篇研究主要發現A族群自身的25年性狀間相關性非常高(r=0.61~0.97, P<.0001),表示最初種子園的優樹選拔有效,子代同時具有高生長及橫向質量生長優勢;而A族群在不同年齡間的性狀相關性則顯示當兩年齡時間間隔較短時相關性會比較高(2年及6年間: r= 0.5, P<.0001; 6年及25年間: r=0.4, P<.0001)。而B族群在5、7、9月齡時的多數性狀都與A族群的25年樹高及材積有一定的相關性存在(│r│= 0.4~0.7)。這樣的結果提示了香杉族群的一年以下幼年性狀有極大的潛力作為早期選拔的指標。

Two groups of progeny trials China-fir populations are used for study age-age phenotypic correlation in this thesis. Both of them are single tree family from a same clonal seed orchard which composed of 25 clones established in 1972 in the central mountain area of Taiwan. The elder progeny test population, A, is composed of 232 trees from 18 maternal families which grown in wild field; the juvenile population, B, is composed of 15,000 seedlings from all the 25 families, grown in nursery garden, this study use only 1,500 seedlings for analysis. The A population are measured in 2, 6, and 25 years for height, diameter breast height and volume as well as annual height growth between age intervals, 27 years wood density is also involved; for B population, the acquired traits are root diameter, root length, fresh and dry biomass, height and ratio of shoot-root biomass as well as sturdiness quotient and Dickson quality index from 5, 7, 9, 13 months seedlings. Results show that both population in field and greenhouse have very high individual heritability for most of the traits (h2=0.35~0.62 and 0.25~1 respectively), and among all the family appear significant variance. Core finding on the correlation demonstrate that self-correlation within population A has strong trait-trait correlation (r=0.61~0.97, P<.0001) in 25 years, and age-age correlation within A exist higher relationship between shorter age intervals (2 & 6 years: r= 0.5, P<.0001; 6 & 25 years: r=0.4, P<.0001). The age-age correlations between two populations reveal that most of the traits in seedling age 5, 7, 9 months have correlations with height and volume in 25 years group (│r│= 0.4~0.7), which indicate that China-fir juvenile traits can serve as indicators for the early selection in a very early growing period.
其他識別: U0005-1408201211142800
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