Genetic variation in root architecture and phosphorus efficiency in response to heterogeneous phosphorus deficiency in Pinus massoniana families

doi:10.3724/SP.J.1258.2011.01226

Abstract

Abstract:

Aims Our aim was to investigate the genotypic variations among semi-sib families of Pinus massoniana for adaptive changes in root morphology and architecture in response to different types of low soil phosphorus (P) availability and their relationships to plant growth and P efficiency.
Methods Pot experiments were conducted during the 2010 growing season in a nursery located in Chun’an County of Zhejiang Province, China. Seven semi-sib families ofP. massoniana contrasting in root architecture and P efficiency were compared for their root morphological and architectural traits and their relationships to plant growth and P efficiency under both heterogeneous and homogeneous low P conditions.
Important findings Large genotypic variations were observed under different types of low-P conditions. The adaptive mechanism for P deficiency was different under heterogeneous and homogeneous low-P conditions. Under homogeneous low-P conditions, adaptive responses of root growth parameters were present in genotypes with high-P efficiency such as ‘3201’ and ‘1217’, while it was not observed in genotypes with low-P efficiency. Root architecture was not closely related to plant P efficiency under homogeneous low-P conditions. Under heterogeneous low-P conditions, root architecture was found to closely related to P efficiency. Genotypes with shallow root architecture had optimal root parameters including root length, surface area and biomass in the top layer of soil, thus having the greater ability for P absorption and having higher P efficiency and biomass. The heritability for the root biomass and the proportion of root in the top soil layer was 0.88 and 0.72, respectively. A significant interactive effect between patterns of low-P conditions and P efficiency was observed. Given that P. massonianahas great genetic potential for adaptation to low-P soils, the selection of high-P efficiency genotypes with optimal root architecture may significantly increase wood production of P. massoniana under low-P conditions.

Key words: Key words family, heterogeneous phosphorus deficiency, phosphorus efficiency, Pinus massoniana, root architecture

YANG Qing, ZHANG Yi, ZHOU Zhi-Chun, MA Xue-Hong, LIU Wei-Hong, FENG Zhong-Ping. Genetic variation in root architecture and phosphorus efficiency in response to heterogeneous phosphorus deficiency in Pinus massoniana families[J]. Chin J Plant Ecol, 2011, 35(12): 1226-1235.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2011.01226

https://www.plant-ecology.com/EN/Y2011/V35/I12/1226

Figures/Tables 7

References 24

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性状 Trait	P水平 P level	家系 Family	家系× P互作 Family × P interaction
整株干物质 Whole plant dry matter	161.00***	14.54***	2.58**
叶干重 Leaf dry weight	134.12***	11.75***	2.57**
茎干重 Stem dry weight	69.23***	9.08***	3.32***
根干重 Root dry weight	94.27***	9.91***	0.76
苗高 Seedling height	44.37***	9.71***	1.37
地径 Ground diameter	84.57***	10.76***	3.79***
P吸收效率 P absorption efficiency	123.00***	7.56***	2.74**
P利用效率 P utilization efficiency	0.63	1.71	0.97

性状 Trait	P水平 P level	家系 Family	家系× P互作 Family × P interaction
整株干物质 Whole plant dry matter	161.00***	14.54***	2.58**
叶干重 Leaf dry weight	134.12***	11.75***	2.57**
茎干重 Stem dry weight	69.23***	9.08***	3.32***
根干重 Root dry weight	94.27***	9.91***	0.76
苗高 Seedling height	44.37***	9.71***	1.37
地径 Ground diameter	84.57***	10.76***	3.79***
P吸收效率 P absorption efficiency	123.00***	7.56***	2.74**
P利用效率 P utilization efficiency	0.63	1.71	0.97

家系 Family	整株干物质积累 Whole plant dry matter accumulation (g)			相对磷效率 Relative phosphorus efficiency (%)
家系 Family	L-P	Hete-P	H-P	L-P/ H-P	Hete-P /H-P
‘1134’	0.639	0.818	1.524	42.3406	53.7804
‘1202’	0.537	0.680	1.081	49.5829	63.0213
‘1217’	0.785	1.029	1.409	56.7069	73.0305
‘3201’	0.800	0.946	1.308	60.5666	72.4349
‘5907’	0.548	0.742	1.091	50.138 0	68.2613
‘5910’	0.610	1.196	1.510	40.5836	79.3103
‘6613’	0.413	0.799	1.051	39.2959	76.0228

家系 Family	整株干物质积累 Whole plant dry matter accumulation (g)			相对磷效率 Relative phosphorus efficiency (%)
家系 Family	L-P	Hete-P	H-P	L-P/ H-P	Hete-P /H-P
‘1134’	0.639	0.818	1.524	42.3406	53.7804
‘1202’	0.537	0.680	1.081	49.5829	63.0213
‘1217’	0.785	1.029	1.409	56.7069	73.0305
‘3201’	0.800	0.946	1.308	60.5666	72.4349
‘5907’	0.548	0.742	1.091	50.138 0	68.2613
‘5910’	0.610	1.196	1.510	40.5836	79.3103
‘6613’	0.413	0.799	1.051	39.2959	76.0228

磷水平 P level	家系 Family	苗高 Seedling height	地径 Ground diameter	叶干重 Leaf dry weight	茎干重 Stem dry weight	底层根 Bottom layer root	中层根 Middle layer root	表层根 Surface layer root	表层根比例 Surface root ratio	根冠比 R/S
L-P	显著性水平 Probability (p)	0.0051	< 0.0001	0.0007	0.0014	0.0822	0.3308	0.0017	0.355	0.0572
L-P	家系遗传力Heritability	0.772	0.870	0.817	0.803	0.681	0.556	0.805	0.348	-
Hete-P	显著性水平 Probability (p)	<0.0001	<0.0001	<0.0001	<0.0001	0.0100	0.0245	<0.0001	0.037	0.1884
Hete-P	家系遗传力Heritability	0.847	0.927	0.912	0.914	0.791	0.750	0.880	0.721	-
H-P	显著性水平 Probability (p)	0.0047	0.0539	0.0003	0.0155	0.0275	0.8067	0.0271	0.027	0.0983
H-P	家系遗传力Heritability	0.774	0.699	0.831	0.741	0.714	0.316	0.731	0.529	-
显著性水平 Probability (p)		<0.0001	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001	0.023	0.0002