Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from <i>Populus simonii</i> × <i>P</i>. <i>nigra</i>
Leaf morphology in <i>Populus</i> L. varies extensively among sections, species and clones under strong genetic control. <i>P. nigra</i> L. (section <i>Aigeiros</i>), with large and triangular leaves, is a commercial forest tree of economic importance for fast gro...
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2020-12-01
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Article |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jingshan Ren Xinyue Ji Changhai Wang Jianjun Hu Giuseppe Nervo Jinhua Li |
spellingShingle |
Jingshan Ren Xinyue Ji Changhai Wang Jianjun Hu Giuseppe Nervo Jinhua Li Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from <i>Populus simonii</i> × <i>P</i>. <i>nigra</i> Forests <i>Populus simonii</i> × <i>P. nigra</i> leaf morphology traits breeding values genetic variation cross combination heterosis |
author_facet |
Jingshan Ren Xinyue Ji Changhai Wang Jianjun Hu Giuseppe Nervo Jinhua Li |
author_sort |
Jingshan Ren |
title |
Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from <i>Populus simonii</i> × <i>P</i>. <i>nigra</i> |
title_short |
Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from <i>Populus simonii</i> × <i>P</i>. <i>nigra</i> |
title_full |
Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from <i>Populus simonii</i> × <i>P</i>. <i>nigra</i> |
title_fullStr |
Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from <i>Populus simonii</i> × <i>P</i>. <i>nigra</i> |
title_full_unstemmed |
Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from <i>Populus simonii</i> × <i>P</i>. <i>nigra</i> |
title_sort |
variation and genetic parameters of leaf morphological traits of eight families from <i>populus simonii</i> × <i>p</i>. <i>nigra</i> |
publisher |
MDPI AG |
series |
Forests |
issn |
1999-4907 |
publishDate |
2020-12-01 |
description |
Leaf morphology in <i>Populus</i> L. varies extensively among sections, species and clones under strong genetic control. <i>P. nigra</i> L. (section <i>Aigeiros</i>), with large and triangular leaves, is a commercial forest tree of economic importance for fast growth and high yield in Europe. <i>P</i>. <i>simonii</i> Carr. (section <i>Tacamahaca</i>) with small land rhomboid ovate leaves performs cold and dry resistance/tolerance in the semi-arid region of Northern China. Leaf morphological traits could be used as early indicators to improve the efficiency of selection. In order to investigate the genetic variation pattern of leaf morphology traits, estimate breeding values (combining ability), as well as evaluate crossing combinations of parents, 1872 intersectional progenies from eight families (<i>P. simonii</i> × <i>P. nigra</i>) and their parents were planted with cuttings for the clonal replicate field trial in Northern China. Four leaf size traits (area, perimeter, length, width) and roundness were measured with leaf samples from the 1-year-old clonal plantation. Significant differences regarding leaf traits were found between and among three female clones of <i>P. simonii</i> from Inner Mongolia, China and six male clones of <i>P. nigra</i> from Casale Monferrato, Italy. The genetic variation coefficient, heritability and genetic variance component of most traits in male parents were greater than these of female parents. Heritability estimates of male and female parents were above 0.56 and 0.17, respectively. Plentiful leaf variations with normal and continuous distributions exited in the hybrid progenies among and within families with the genetic variation coefficient and heritability above 28.49 and 0.24, respectively. Heritability estimates showed that leaf area was the most heritable trait, followed by leaf width. The breeding value ranking of parents allowed us to select the parental clones for new crosses and extend the mating design. Two male parental clones (N430 and N429) had greater breeding values (general combining ability, GCA) of leaf size traits than other clones. The special combining ability (SCA) of the crossing combination between <i>P. simonii</i> cl. ZL-3 and <i>P. nigra</i> cl. N430 was greater than that of others. Eight putatively superior genotypes, most combined with the female parental clone ZL-3, can be selected for future testing under near-commercial conditions. Significant genetic and phenotypic correlations were found between five leaf morphology traits with the coefficients above 0.9, except for leaf roundness. The results showed that leaf morphology traits were under strong genetic control and the parental clones with high GCA and SCA effects could be utilized in heterosis breeding, which will provide a starting point for devising a new selection strategy of parents and progenies. |
topic |
<i>Populus simonii</i> × <i>P. nigra</i> leaf morphology traits breeding values genetic variation cross combination heterosis |
url |
https://www.mdpi.com/1999-4907/11/12/1319 |
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doaj-a57a75334ac441838e80dceb1a9ef08e2020-12-12T00:00:48ZengMDPI AGForests1999-49072020-12-01111319131910.3390/f11121319Variation and Genetic Parameters of Leaf Morphological Traits of Eight Families from <i>Populus simonii</i> × <i>P</i>. <i>nigra</i>Jingshan Ren0Xinyue Ji1Changhai Wang2Jianjun Hu3Giuseppe Nervo4Jinhua Li5State Key Laboratory of Forest Genetics and Tree Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, ChinaState Key Laboratory of Forest Genetics and Tree Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, ChinaState Key Laboratory of Forest Genetics and Tree Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, ChinaState Key Laboratory of Forest Genetics and Tree Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, ChinaCREA-Centro di Ricerca Foreste e Legno, Strada Frassineto, 35-15033 Casale Monferrato, ItalyState Key Laboratory of Forest Genetics and Tree Breeding, Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, ChinaLeaf morphology in <i>Populus</i> L. varies extensively among sections, species and clones under strong genetic control. <i>P. nigra</i> L. (section <i>Aigeiros</i>), with large and triangular leaves, is a commercial forest tree of economic importance for fast growth and high yield in Europe. <i>P</i>. <i>simonii</i> Carr. (section <i>Tacamahaca</i>) with small land rhomboid ovate leaves performs cold and dry resistance/tolerance in the semi-arid region of Northern China. Leaf morphological traits could be used as early indicators to improve the efficiency of selection. In order to investigate the genetic variation pattern of leaf morphology traits, estimate breeding values (combining ability), as well as evaluate crossing combinations of parents, 1872 intersectional progenies from eight families (<i>P. simonii</i> × <i>P. nigra</i>) and their parents were planted with cuttings for the clonal replicate field trial in Northern China. Four leaf size traits (area, perimeter, length, width) and roundness were measured with leaf samples from the 1-year-old clonal plantation. Significant differences regarding leaf traits were found between and among three female clones of <i>P. simonii</i> from Inner Mongolia, China and six male clones of <i>P. nigra</i> from Casale Monferrato, Italy. The genetic variation coefficient, heritability and genetic variance component of most traits in male parents were greater than these of female parents. Heritability estimates of male and female parents were above 0.56 and 0.17, respectively. Plentiful leaf variations with normal and continuous distributions exited in the hybrid progenies among and within families with the genetic variation coefficient and heritability above 28.49 and 0.24, respectively. Heritability estimates showed that leaf area was the most heritable trait, followed by leaf width. The breeding value ranking of parents allowed us to select the parental clones for new crosses and extend the mating design. Two male parental clones (N430 and N429) had greater breeding values (general combining ability, GCA) of leaf size traits than other clones. The special combining ability (SCA) of the crossing combination between <i>P. simonii</i> cl. ZL-3 and <i>P. nigra</i> cl. N430 was greater than that of others. Eight putatively superior genotypes, most combined with the female parental clone ZL-3, can be selected for future testing under near-commercial conditions. Significant genetic and phenotypic correlations were found between five leaf morphology traits with the coefficients above 0.9, except for leaf roundness. The results showed that leaf morphology traits were under strong genetic control and the parental clones with high GCA and SCA effects could be utilized in heterosis breeding, which will provide a starting point for devising a new selection strategy of parents and progenies.https://www.mdpi.com/1999-4907/11/12/1319<i>Populus simonii</i> × <i>P. nigra</i>leaf morphology traitsbreeding valuesgenetic variationcross combinationheterosis |