Effects of triploid status on growth, photosynthesis, and leaf area in Populus

Published Date

August 2016, Volume 30, Issue 4, pp 1137-1147

First online: 20 January 2016

Title 

Effects of triploid status on growth, photosynthesis, and leaf area in Populus

• Author 

• Ting Liao
• , Shiping Cheng
• , Xiaohu Zhu
• , Yu Min
• , Xiangyang Kang

• 
  

• Abstract

• Key message

  The growth vigor of Populus triploid groups explained by higher photosynthetic rate in the vertical canopy gradient, higher relative chlorophyll content, and larger leaf area, compared to diploid group.

  Abstract

  Polyploids show vegetative growth superiority compared to diploids, however, the reason remains unclear. Here, we explored this observation based on variations in 12 phenotypic traits including vegetative growth, leaf area, and photosynthesis using 120 genotypes with three allotriploid groups of different heterozygosities (obtained using three types of 2n gametes) and one diploid group obtained from the same parents in Populus. Wide ranges in phenotypic variation (2.70–38.34 %) were detected in all traits within the progeny population. In addition, the vegetative growth traits, net photosynthetic rate (Pn), relative chlorophyll content index (CCI), leaf area (LA), and photosynthetic efficiency of whole leaves (PEw) in the polyploid group were significantly higher than those in the diploid group, indicating that certain polyploid groups had greater advantages in these respects. However, there were also significant differences in vegetative growth, Pn, LA, and PEw among the three allopolyploid groups, which probably resulted from the 2n gametes with different origins transferring different heterozygosities. Furthermore, a higher Pn of vertical canopy gradient photosynthesis was observed in triploid groups compared to the diploid group. In general, the greater vegetative growth advantages in relation to photosynthesis in the triploid groups were explained by three reasons including a higher Pn which probably resulted from a higher CCI, a higher PEw mainly caused by a larger LA, and a lower aging rate of mature leaves.

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