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Growth, proline content and proline-associated gene expression of autotetraploid Betula platyphylla responding to NaHCO3 stress

100%

Mu H., Lin L., Zhang Q., Tang X., Zhang X., Cheng G.

Dendrobiology

2016

tom 75

Plant breeders have focused much attention on polyploid trees because of their resistance for forestry. To evaluate the impact of intraspecies genome duplication on NaHCO3 stress, a series of Betula platyphylla autotetraploids and diploids were generated from the same family. The growth, proline content and proline-associated gene expression of these autotetraploid individuals were compared with those diploid trees. Autotetraploids were superior in injury index and relative growth of height and base diameter compared to diploids. The proline content was higher in autotetraploid individuals compared to diploids. Gene expression data revealed autotetraploids were generally higher expression in BpP5CS1, BpP5CS2, Bp- P5CR1, BpP5CR2, BpP5CR3 and BpOAT and were lower expression in BpProDH and BpP5CDH compared to diploid trees. These results shed light on resistance variation in birch autotetraploidization and polyploidy breeding as a new approach for genetic improvement of birch trees.

Sok brzozy Betula platyphylla jako wskaźnik występowania złóż surowców mineralnych

100%

Mizerski W.

Wszechświat

1991

tom 92

nr 02-03

Simulation of light regimes in typical subalpine forest succession series of Eastern Tibetan Plateau

80%

Wang Q., Wu N., Luo P.

Polish Journal of Ecology

2009

tom 57

nr 2

251-260

Natural regeneration of forest depends on the light regimes of floor. Point-based methods such as fisheye photo and radiometer can not provide a full panorama of light regime of heterogeneous forest stand. Eastern Tibetan Plateau is a major forest belt characteristic of diverse forest type and topographic differentiation. Understanding the trend of changes of light regime along succession series of forest may be helpful for the management of ecosystems. Fragmented forest patches due to tectonic activity and human intervention have made this prediction difficult. We use a spatially explicit forest stand light model (tRAYci) to simulate light distribution within forest in typical subalpine forest succession series of eastern Tibetan Plateau. Due to the spatial heterogeneity of tree distribution in the subalpine area, the forest stand can be approximated with a spatially explicit model of trees. Three typical subalpine forest stands (Sabina forest (SF), Fir forest (FF) and Birch forest (BF)) are selected in the eastern Tibetan Plateau. The dominant species are sabina (Sabina saltuaria (Rehd. et Wils.) Cheng), fir (Abies faxoniana Rehd. et Wils.) and birch (Betula platyphylla Suk.) for each stand and they are spatially clumped in distribution. They represent old growth coniferous forest (SF, 330 years old), coniferous-broadleaved forest (FF, 180 ys) and pioneer broadleaved forest (BF, 40 ys). The parameters of the three-dimensional model of trees are calibrated with field measurements. The simulated values are generally consistent with observed values of radiation measured by radiometers installed in these stands and values derived from fisheye photos. Test failures may be caused by the incomplete submodel of crown as a gap free one. Light regimes in old growth and pioneer forest are much more heterogeneous than intermediate stages of forest. Light regimes of these forests are also reflected by the composition of understory herb layers.

Ograniczanie wyników

1 Dendrobiology

1 Polish Journal of Ecology

1 Wszechświat

1 Cheng G.

1 Lin L.

1 Luo P.

1 Mizerski W.

1 Mu H.

1 Tang X.

1 Wang Q.

1 Wu N.

1 Zhang Q.

1 Zhang X.

1 2016

1 2009

1 1991

Wyniki wyszukiwania

Growth, proline content and proline-associated gene expression of autotetraploid Betula platyphylla responding to NaHCO3 stress

Sok brzozy Betula platyphylla jako wskaźnik występowania złóż surowców mineralnych

Simulation of light regimes in typical subalpine forest succession series of Eastern Tibetan Plateau