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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (9): 1653-1664.doi: 10.16420/j.issn.0513-353x.2020-0561

• Research Papers • Previous Articles     Next Articles

Anatomical Observation on the Tortuousness of Ziziphus jujuba var. tortuosa Branches

GUO Xuemin*(), WANG Xinrui, WANG Yingying, LI Zheng, MIAO Ningning, WANG Zhaojun   

  1. College of Oceanic Resources and Environment,Hebei Normal University of Science & Technology,Changli,Hebei 066600,China
  • Received:2021-06-18 Revised:2021-08-20 Online:2021-09-25 Published:2021-09-30
  • Contact: GUO Xuemin E-mail:xueminguo@126.com

Abstract:

Taking the twisted tortuous branch segment and twisted straight branch segment of annual branches in Ziziphus jujuba Mill. var. tortuosa as experimental materials,the morphological,anatomical and vessel characteristics of its branches were observed and compared by xylotomy and wood segregation techniques. The differences of anatomical structures between twisted tortuous branch segment and twisted straight branch segment were mainly manifested in the number,shape and distribution of abnormal secondary structures. Compared with the twisted straight branch segment,the number of auxillary bundles in twisted tortuous branch segments was more,and there were three auxillary bundles adjacent to each other,which were relatively concentrated in the inner bend of the segments;The number of interxylary phloem was about the same as that of the twisted straight branch segment,and its end expanded,which was different from the slightly curved elliptic columnar shape of the twisted straight branch segment,and relatively concentrated in the outer bend of the segments;The number of medullary vascular bundles was slightly reduced. At the cellular level,the vessel elements at the inner and outer bends of the twisted tortuous branch segments of the variety were all reticulate vessels with single perforation and various shapes. Among them,the number of vessel elements with tails at both ends and sloped at both ends at the inner bend were 28.0% and 20.2% less than those at the outer bend,respectively. The number of vessels without tails at either ends,sloped at one end and horizontal at both ends were 17.9%,375.0% and 200.0% more,respectively. The number of vessels with one tail at one end was the same. The end wall slope of end wall was 10.1% larger than that at the outer bend,and the length of vessel element was 16.4% shorter than that at the outer bend,while the diameter was 18.6% smaller than that at the outer bend. The hypothesis of “abnormal structure-spatial difference-coordination”was put forward. The tortuous branch traits of Z. jujuba var. tortuosa may be the result of the unbalanced growth rates and forces at different locations of the branches caused by the spatial difference and coordination of the number,the mechanical tension,the transport and utilization of the assimilated products of the three abnormal secondary structures,namely the auxillary bundle,interxylary phloem and medullary bundle.

Key words: Ziziphus jujuba, tortuous branch, abnormal secondary structure, vessel element

CLC Number: