DIFFERENT CHARACTERISTICS OF PHOTOSYNTHESIS IN STEMS AND LEAVES OF MIKANIA MICRANTH

doi:10.17521/cjpe.2006.0128

Abstract

Abstract:

Background and Aims Mikania micranth is a well-known invasive species. Study of its characteristics will increase our knowledge of invasive mechanisms and management of invasive species. Photosynthesis of leaves is one of the invasive characteristics of M. micranth, but no studies have focused on assimilation characteristics of its stems.

Methods We compared young green stems and mature leaves using the LI-6400 gas exchange and fluorescence system, as well as laser scanning confocal microscopy to observe the distribution of chlorophyll.

Key Results Electron transport rate (ETR) and actual photochemical efficiency of system Ⅱ (Φ_PSⅡ) of stems and leaves were positively correlated (0.97), suggesting similar photosynthetic structure in stems and leaves. The gas exchange rate under constant conditions was stable for leaves but fluctuating for stems, possibly because of the pore factor of stems. Under the same area and saturated light (PPFD=2 000 μmol·m ^-2·s^-1), the ETR of leaves was 42.44 μmol·m ^-2·s^-1 and the ETR of stems was 30.32 μmol·m ^-2·s^-1. However, under the same area and low light (PPFD=10 μmol·m ^-2·s^-1), the Φ_PSⅡ of leaves was 0.69 and the Φ_PSⅡ of stems was 0.57. The electron transport rate in stems was 4.24 per unit SPAD, 2.3 times that of leaves. Actual photochemical efficiency of system Ⅱ was 0.08 per unit SPAD, 3 times that of leaves. Our research also indicated that light adaptive ability was better in stems than in leaves. Chlorophyll existed mainly in two tissues: cortex and around vascular bundles. It is possible that there are different chlorophyll functions in different tissues.

Conclusions This study indicates that photosynthesis occurred in young green stems of M. micrantha and the instantaneous efficiency of light utilization in stems was higher than in leaves. Results were unclear regarding the function of chlorophyll in different tissues.

Key words: Photosynthesis, Fluorenscence of chlorophyll, Electron transport rate, Actual photochemical efficiency of PSⅡ, Characteristics of gas exchange

ZU Yuan-Gang, ZHANG Zhong-Hua, WANG Wen-Jie, YANG Feng-Jian, HE Hai-Sheng. DIFFERENT CHARACTERISTICS OF PHOTOSYNTHESIS IN STEMS AND LEAVES OF MIKANIA MICRANTH[J]. Chin J Plant Ecol, 2006, 30(6): 998-1004.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2006.0128

https://www.plant-ecology.com/EN/Y2006/V30/I6/998

Figures/Tables 10

Fig.1 Gas exchange rate of stems in different photosynthetic photon flux density (PPFD)

Fig.2 Gas exchange rate of leaves in different photosynthetic mphoton flux density (PPFD)

Fig.3 Correlation of actual photochemical efficiency of PSⅡ (ΦPSⅡ) in stems and leaves

Fig.4 Correlation of electron transport rate (ETR) in stems and leaves

Fig.5 Different actual photochemical efficiency of PSⅡ in stems and leaves PPFD: Photosynthetic photo flux density

Fig.6 Different electron transport rate (ETR) in stems and leaves

Fig.7 Different actual photochemical efficiency of PSⅡ per SPAD in stems and leaves

Fig.8 Different electron transport rate (ETR) per SPAD in stems and leaves

Fig.9 Actual distribution of chlorophyll in stems (magnify 200 times)

Fig.10 Distribution of fluorenscent intensity in stems (no background-corrected fluorescence intensity)

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