Quantitative trait locus （QTL） detection was carried out for growth traits in 122 F1 progenies of Pinus elliottiivar. elliottii （PEE） x tR caribaea var. hondurensis （PCH） hybrid. The PCH male parent linkage map ...Quantitative trait locus （QTL） detection was carried out for growth traits in 122 F1 progenies of Pinus elliottiivar. elliottii （PEE） x tR caribaea var. hondurensis （PCH） hybrid. The PCH male parent linkage map contained 108 mark- ers in 16 linkage groups, while the PEE female parent contained 93 markers in 19 linkage groups. Sequence-related amplified polymorphism （SRAP）, microsatellite （SSR）, expressed sequence tag polymorphism （ESTP） and inter-simple sequence repeat （ISSR） were selected from an existing linkage map. Growth traits investigated were height at age five （HT05） and six years （HT06）, diameter at breast height at age five （DBH05） and six years （DBH06） and annual growth from age five to six years of height （AGHT） and diameter at breast height （AGDBH）. KruskaI-Wallis and interval mapping approaches were used to estimate levels of significance, the number of QTLs, the percentage of the phenotypic varia- tion explained by each of QTLs and their positions on the genetic linkage maps. Twenty six QTLs with significance levels p 〈 0.05 were detected on the parental maps for the six growth traits, which explained more than 15% of the phenotypic variation, suggesting an existence of major-effect genes. Several QTLs had the pleiotropy controlling more than one sin- gle growth trait. Overall, the proportion of phenotypic variation explained by QTLs ranged from 5.9% to 40.6% for HT05 and HT06, from 6.6% to 42.0% for DBH05 and DBH06 and from 5.8% to 22.3% for AGHT and AGDBH. The results from this study provide a basis for marker-aided selection （MAS） in PEE x PCH hybrids.展开更多
Family outcrossing rates of Pinus caribaea var. caribaea populations that differed in origin and management were estimated by using isozyme markers. The family outcrossing rates were estimated by (1)fixing the probabi...Family outcrossing rates of Pinus caribaea var. caribaea populations that differed in origin and management were estimated by using isozyme markers. The family outcrossing rates were estimated by (1)fixing the probability of pollen gene frequency (p); (2) allowing pollen gene frequency to vary among families. The estimates of family outcrossing rates for all the populations varied widely among families (clones of the seed orchard), ranging from 0.39 to 2.0. The average family outcrossing rates of both m...展开更多
Forest development type(FDT) is an expectation pattern for forest management object. Based on investigation data and reference to other stands data in the similar environment,FDT of Pinus caribaea in Baisha County,Hai...Forest development type(FDT) is an expectation pattern for forest management object. Based on investigation data and reference to other stands data in the similar environment,FDT of Pinus caribaea in Baisha County,Hainan Province was designed. Accordidng to the condition of forest stand,it was the object to transform pure coniferous stand to close to nature stand with the structure of coniferous broadleafed mixed forest. On the other hand,visualization of FDT by LMS(landscape management system),was performed for management Pinus caribaea in future.展开更多
The effects of litter removal on soil properties in a Pinus caribaea stand were studied by comparing with a litter reserved stand.Results showed that the mean diameter at breast height(DBH) and mean tree height in the...The effects of litter removal on soil properties in a Pinus caribaea stand were studied by comparing with a litter reserved stand.Results showed that the mean diameter at breast height(DBH) and mean tree height in the litter removal stand were 21% and 11% smaller than those in the litter reserved stand,respectively.Soil physical properties of the litter removal stand became poor due to litter removal with an increase of 5% in soil bulk density and decrease of 6%,7%,7%,10% and 4% in capillary porosity,non-capillary porosity,total porosity,capillary water and natural water content,respectively,and the contents of clay significantly decreased by 16%;After litter removal,the soil organic matter,total N,total P,total K,alkalized N and available K significantly decreased by 43%,64%,11%,40%,32% and 14.5%,respectively,and available P decreased by 2%;The number of bacteria decreased by 8%,and the numbers of fungi and actinomyces significantly decreased by 38% and 63%,respectively,and the activities of urease,acid phosphatase and catalase significantly decreased by 55%,69% and 72%,respectively.展开更多
基金financially supported by the National Natural Science Foundation of China (No. 30671706)
文摘Quantitative trait locus （QTL） detection was carried out for growth traits in 122 F1 progenies of Pinus elliottiivar. elliottii （PEE） x tR caribaea var. hondurensis （PCH） hybrid. The PCH male parent linkage map contained 108 mark- ers in 16 linkage groups, while the PEE female parent contained 93 markers in 19 linkage groups. Sequence-related amplified polymorphism （SRAP）, microsatellite （SSR）, expressed sequence tag polymorphism （ESTP） and inter-simple sequence repeat （ISSR） were selected from an existing linkage map. Growth traits investigated were height at age five （HT05） and six years （HT06）, diameter at breast height at age five （DBH05） and six years （DBH06） and annual growth from age five to six years of height （AGHT） and diameter at breast height （AGDBH）. KruskaI-Wallis and interval mapping approaches were used to estimate levels of significance, the number of QTLs, the percentage of the phenotypic varia- tion explained by each of QTLs and their positions on the genetic linkage maps. Twenty six QTLs with significance levels p 〈 0.05 were detected on the parental maps for the six growth traits, which explained more than 15% of the phenotypic variation, suggesting an existence of major-effect genes. Several QTLs had the pleiotropy controlling more than one sin- gle growth trait. Overall, the proportion of phenotypic variation explained by QTLs ranged from 5.9% to 40.6% for HT05 and HT06, from 6.6% to 42.0% for DBH05 and DBH06 and from 5.8% to 22.3% for AGHT and AGDBH. The results from this study provide a basis for marker-aided selection （MAS） in PEE x PCH hybrids.
文摘Family outcrossing rates of Pinus caribaea var. caribaea populations that differed in origin and management were estimated by using isozyme markers. The family outcrossing rates were estimated by (1)fixing the probability of pollen gene frequency (p); (2) allowing pollen gene frequency to vary among families. The estimates of family outcrossing rates for all the populations varied widely among families (clones of the seed orchard), ranging from 0.39 to 2.0. The average family outcrossing rates of both m...
文摘Forest development type(FDT) is an expectation pattern for forest management object. Based on investigation data and reference to other stands data in the similar environment,FDT of Pinus caribaea in Baisha County,Hainan Province was designed. Accordidng to the condition of forest stand,it was the object to transform pure coniferous stand to close to nature stand with the structure of coniferous broadleafed mixed forest. On the other hand,visualization of FDT by LMS(landscape management system),was performed for management Pinus caribaea in future.
文摘The effects of litter removal on soil properties in a Pinus caribaea stand were studied by comparing with a litter reserved stand.Results showed that the mean diameter at breast height(DBH) and mean tree height in the litter removal stand were 21% and 11% smaller than those in the litter reserved stand,respectively.Soil physical properties of the litter removal stand became poor due to litter removal with an increase of 5% in soil bulk density and decrease of 6%,7%,7%,10% and 4% in capillary porosity,non-capillary porosity,total porosity,capillary water and natural water content,respectively,and the contents of clay significantly decreased by 16%;After litter removal,the soil organic matter,total N,total P,total K,alkalized N and available K significantly decreased by 43%,64%,11%,40%,32% and 14.5%,respectively,and available P decreased by 2%;The number of bacteria decreased by 8%,and the numbers of fungi and actinomyces significantly decreased by 38% and 63%,respectively,and the activities of urease,acid phosphatase and catalase significantly decreased by 55%,69% and 72%,respectively.
文摘松类杂种直到20世纪中期才开始被培育利用,如窄果松×辐射松（Pinus attenuata×P.radiata）、欧洲落叶松×日本落叶松（Larix decidua×L.kaempferi）等（Dungey,2001）。同时,松属种间的一些杂种在其亲本自然分布区外获得较大成功1）（Nikles,2000;Peter,1979;Khurana et al.,1998;Lopez-Upton,1999）。同样。
