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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (7): 172-184.DOI: 10.11686/cyxb2021425

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Leaf structure and photosynthetic characteristics of two species of Hesperis

Meng-yu DONG1(), Jin-xin WANG1, Meng WU1, Zi-yao ZHOU1, Shun CHENG2, Yan-hui LI1()   

  1. 1.College of Landscape and Tourism,Hebei Agricultural University,Baoding 071000,China
    2.Saihanba Mechanized Forest Farm of Hebei Province,Chengde 067000,China
  • Received:2021-11-23 Revised:2022-02-15 Online:2022-07-20 Published:2022-06-01
  • Contact: Yan-hui LI

Abstract:

This research studied the functional leaf morphology, anatomical structure, pigment content, chlorophyll fluorescence and photosynthetic parameters of Hesperis matronalis and wild-type Hesperis sibirica from two localities (Wuling Mountain and Saihanba) in Hebei Province. The relationships between leaf structure and photosynthetic physiology of the two species of Hesperis were explored using correlation and redundancy analysis methods. It was found that: 1) There were intraspecific differences in leaf structure and photosynthetic physiology of the two wild-type H.sibirica collections. The H. sibirica from Wuling Mountain had comparatively greater leaf thickness (LT), larger leaf area (LA), thicker palisade parenchyma thickness (PPT), richer pigment content, and higher net photosynthetic rate (Pn). The H. sibirica from Saihanba had comparatively high leaf stomatal density (SD), greater sponge parenchyma thickness (SPT), increased diameters of vessel and sieve tubes (VD and STD), high activity parameters for the PSⅡ reaction center, and strong transpiration rate (Tr). H. matronalis leaves had high epidermal trichome density (ETD), a high ratio of palisade parenchyma thickness to sponge parenchyma thickness (PPT∶SPT), rich pigment content, and high Pn and water use efficiency (WUE), when compared with values for H. sibirica. 2) There was a strong correlation between the leaf structure and the photosynthetic physiological parameters of the two species of Hesperis. Important links between leaf structure and photosynthetic physiological differences and were identified by redundancy analysis, involving the parameters PPT∶SPT, SPT, ETD, spongy ratio, LA, VD, PPT and VBD. Among these, the effect of PPT∶SPT (P<0.05) was mathematically largest and provided the strongest single-trait association with differences in the ecological adaptability and resource acquisition of the two Hesperis species. Overall, the two species of Hesperis performed well at the sites where they were introduced and showed promise for development and utilization as garden plants. The PPT∶SPT could be used as a reference indicator trait for screening high-light-efficiency germplasm lines of Hesperis.

Key words: Hesperis sibirica, Hesperis matronalis, leaf, anatomical structure, photosynthetic characteristics