Factors involved in the success of Castanea henryi stem cuttings in different cutting mediums and cutting selection peri
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ORIGINAL PAPER
Factors involved in the success of Castanea henryi stem cuttings in different cutting mediums and cutting selection periods Wangzun Chen1 · Libing He1 · Shiyi Tian1 · Joseph Masabni2 · Huan Xiong1 · Feng Zou1 · Deyi Yuan1
Received: 9 March 2020 / Accepted: 30 June 2020 © Northeast Forestry University 2020
Abstract Chinquapin (Castanea henryi) is a dual-purpose tree species in China valued for as a source of timber and starch. We investigated the effect of four cutting mediums (pure vermiculite; peat:river sand at 3:1 v/v; peat:krasnozem at 1:1 v/v; and pure krasnozem) and three stem cutting periods (March, May, and July) on rooting performance of C. henryi cuttings. Different cutting periods and cutting mediums greatly influenced the rooting rate of C. henryi, ranging from 3.35 to 77.31%. Principal component analysis indicated that the best combination of cutting period and cutting medium was semi-hardwood cuttings (May Wangzun Chen and Libing He have contributed equally to this work. Project funding: This research was funded by the National Natural Science Foundation of China (Grant Nos. 31870674, 31500554) and the Natural Science Foundation of Hunan Province (Grant No. 2018JJ3870). The online version is available at http://www.springerlink.com Corresponding editor: Yu Lei. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11676-020-01208-5) contains supplementary material, which is available to authorized users. * Feng Zou [email protected] * Deyi Yuan [email protected] 1
Key Laboratory of Cultivation and Protection for Non‑Wood Forest Trees, Ministry of Education, Central South University of Forestry and Technology, Changsha 410004, People’s Republic of China
2
Texas A&M AgriLife Center at Dallas, 17360 Coit Rd, Dallas, TX 75252, USA
cuttings) + krasnozem. Histological evidence indicated that adventitious root initials were present by week 5–6, and that the site of root primordia initiation was observed in the vascular cambium. Stem anatomical structures observed at different periods indicated that a xylem/radius ratio of 29.90–37.42% and a fractured phloem fiber ring are indicative of rooting success. The relational model between rooting index and medium properties indicated that nutrient content and porosity significantly influenced callus production. However, pH strongly affected C. henryi root formation, with the Pearson correlation coefficients for May and July cuttings of − 0.856 and − 0.947, respectively. Our protocol is helpful to achieve mass clone propagation of improved C. henryi genotypes, thus overcoming a common hurdle in chinquapin breeding programs. Keywords Adventitious roots formation · Castanea henryi · Medium pH · Phloem fiber ring · Xylem
Introduction Chinquapin (Castanea henryi (Skan) Rehder & E.H. Wilson) is an economically and ecologically important species of the Castanea genus, and is widely distributed in southern China, especially in the Fujian, Zhejiang, and Hunan provinces of China (Fan et al. 2015)
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