Photosynthetica 2019, 57(1):303-310 | DOI: 10.32615/ps.2019.021

Shading of mature leaves systemically regulates photosynthesis and leaf area of new developing leaves via hormones

Y.S. WU1,2,3, W.Z. GONG4,5, Y.M. WANG1,2,3, W.Y. YANG1,2,3
1 College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China
2 Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu 611130, China
3 Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu 611130, China
4 Characteristic Crops Research Institute, Chongqing Academy of Agricultural Sciences, Chongqing, 402160, China

In order to explore whether leaf area of developing leaves was regulated by systemic irradiance signal from mature leaves, we investigated the leaf area, leaf anatomy, photosynthesis, auxin, gibberellin, and cytokinin contents of new developing leaves in soybean growing under conditions of shaded mature leaves (MS), shaded whole plants (WS), and under full sunlight (NS). The results showed that developing leaves under MS exhibited the higher leaf area and leaf mass than that of WS. Blade thickness, palisade tissue thickness, sponge tissue thickness, cell size, cell numbers, net photosynthetic rate, stomatal conductance, transpiration rate, and cytokinin content of developing leaves under MS were lower, while auxin and gibberellin contents were higher than that of NS. These results indicate that the leaf area, leaf anatomy, and photosynthesis of developing leaves were regulated by the shading environment of mature leaves. Growth hormones may possibly act as candidate signal substances to systemic regulation of leaf area development.

Additional key words: leaf structure; photosynthesis; shade; systemic response.

Received: January 3, 2018; Accepted: July 20, 2018; Prepublished online: December 7, 2018; Published: January 30, 2019  Show citation

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WU, Y.S., GONG, W.Z., WANG, Y.M., & YANG, W.Y. (2019). Shading of mature leaves systemically regulates photosynthesis and leaf area of new developing leaves via hormones. Photosynthetica, 57(1), 303-310. doi: 10.32615/ps.2019.021
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