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. 2016 May 16:6:25908.
doi: 10.1038/srep25908.

Dynamic allocation and transfer of non-structural carbohydrates, a possible mechanism for the explosive growth of Moso bamboo (Phyllostachys heterocycla)

Xinzhang Song  1 , Changhui Peng  2   3 , Guomo Zhou  1 , Honghao Gu  1 , Quan Li  1 , Chao Zhang  1
Affiliations

Dynamic allocation and transfer of non-structural carbohydrates, a possible mechanism for the explosive growth of Moso bamboo (Phyllostachys heterocycla)

Xinzhang Song et al. Sci Rep. .

Abstract

Moso bamboo can rapidly complete its growth in both height and diameter within only 35-40 days after shoot emergence. However, the underlying mechanism for this "explosive growth" remains poorly understood. We investigated the dynamics of non-structural carbohydrates (NSCs) in shoots and attached mature bamboos over a 20-month period. The results showed that Moso bamboos rapidly completed their height and diameter growth within 38 days. At the same time, attached mature bamboos transferred almost all the NSCs of their leaves, branches, and especially trunks and rhizomes to the "explosively growing" shoots via underground rhizomes for the structural growth and metabolism of shoots. Approximately 4 months after shoot emergence, this transfer stopped when the leaves of the young bamboos could independently provide enough photoassimilates to meet the carbon demands of the young bamboos. During this period, the NSC content of the leaves, branches, trunks and rhizomes of mature bamboos declined by 1.5, 23, 28 and 5 fold, respectively. The trunk contributed the most NSCs to the shoots. Our findings provide new insight and a possible rational mechanism explaining the "explosive growth" of Moso bamboo and shed new light on understanding the role of NSCs in the rapid growth of Moso bamboo.

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Figures

Figure 1
Figure 1. Sketch of relationships among shoot, mature Moso bamboo and rhizome.
The map was designed and created by Xinzhang Song and Chao Zhang using Adobe Photoshop 7.0 (Adobe Systems Software Ireland Ltd).
Figure 2
Figure 2. Height growth and biomass accumulation of Moso bamboo shoots: young bamboos after shoot emergence.
The bar denote the standard error (n = 3). The same notation is used below.
Figure 3
Figure 3. Dynamics of the non-structural carbohydrate (NSC) content of Moso bamboo shoots: young bamboos after shoot emergence.
Figure 4
Figure 4. Dynamics of the non-structural carbohydrate (NSC) content of each part of attached mature Moso bamboos over a 20-month period (from January 2014 to August 2015).
(a) leaf; (b) branch; (c) trunk; (d) rhizome. Different lowercase letters indicate significant differences (P < 0.05) in the NSC content among samplings.
See this image and copyright information in PMC

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