Hybridizing Effect Analysis between Pinus elliottii var.elliottii and Pinus caribaea var.hondurensis

ZHAO Fen-cheng; LI Xian-zheng; ZHANG Ying-zhong; LI Fu-ming; LIU Hong-jie; CAI Jian

One test plot was established in 1996 in Taishan,Guangdong,which included 24 crosses between 5 clones of Pinus caribaea var.hondurensis(PCH) and 11 clones of Pinus elliottii var.elliottii(PEE),8 PEE full-sib families and 9 PEE open-pollinated families,2 PEE×PCH seedlots from Australia,as well as one checklot from primary slash pine seed orchard in Taishan,Guangdong.All trees in the test were measured at the age of 9 for height and diameter at breast height(dbh).Individual volume was calculated by height and dbh.It was found the PEE×PCH hybrids produced great heteosis,the real average gain was 221.36% for volume.The order of growth increment between groups was PEE×PCH>PEE×PEE>PEE(op.)>CK.Fifteen hybrid families were selected in the test for their better growth performance.Their increment were from 10.96 m to 12.57 m,17.42 cm to 21.25 cm,0.156 2 m3 to 0.236 7 m3,141.75 m3 to 233.82 m3 for height,dbh,volume and volume per hectare,respectively.Their gains were from 216.19% to 379.15% for volume,compared to CK.Four hybrid parents which had more reliable and greater GHA values were selected;they were able to be used in massive hybridization.Significant positive correlation existed between the general combining ability(GCA) of height and general hybridizing ability(GHA) of height,dbh and volume,among clones of PEE.The growth performance of the PEE×PCH families was related closely with the GHA of their parents,especially with the sum of GHA of parents,the correlation coefficients were above 0.891 8.

1. Guangdong Forest Research Institute, Guangzhou 510520, Guangdong, China

2. Taishan Hongling Seed Orchard, Taishan 529200, Guangdong, China

Received Date: 2005-11-28

Abstract: One test plot was established in 1996 in Taishan,Guangdong,which included 24 crosses between 5 clones of Pinus caribaea var.hondurensis(PCH) and 11 clones of Pinus elliottii var.elliottii(PEE),8 PEE full-sib families and 9 PEE open-pollinated families,2 PEE×PCH seedlots from Australia,as well as one checklot from primary slash pine seed orchard in Taishan,Guangdong.All trees in the test were measured at the age of 9 for height and diameter at breast height(dbh).Individual volume was calculated by height and dbh.It was found the PEE×PCH hybrids produced great heteosis,the real average gain was 221.36% for volume.The order of growth increment between groups was PEE×PCH>PEE×PEE>PEE(op.)>CK.Fifteen hybrid families were selected in the test for their better growth performance.Their increment were from 10.96 m to 12.57 m,17.42 cm to 21.25 cm,0.156 2 m3 to 0.236 7 m3,141.75 m3 to 233.82 m3 for height,dbh,volume and volume per hectare,respectively.Their gains were from 216.19% to 379.15% for volume,compared to CK.Four hybrid parents which had more reliable and greater GHA values were selected;they were able to be used in massive hybridization.Significant positive correlation existed between the general combining ability(GCA) of height and general hybridizing ability(GHA) of height,dbh and volume,among clones of PEE.The growth performance of the PEE×PCH families was related closely with the GHA of their parents,especially with the sum of GHA of parents,the correlation coefficients were above 0.891 8.

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Hybridizing Effect Analysis between Pinus elliottii var.elliottii and Pinus caribaea var.hondurensis

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