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A Photomixotrophic System to Improve the Growth of In Vitro-Cultured Seedlings of Coconut (Cocos nucifera L.)

文献类型： 外文期刊

作者： Mu, Zhihua 1 ; Li, Zhiying 3 ; Nulu, Naga Prafulla Chandrika 1 ; Kalaipandian, Sundaravelpandian 1 ; Biddle, Julianne M. 1 ; Bazrafshan, Amirhossein 1 ; Kong, Eveline 1 ; Adkins, Steve W. 1 ;

作者机构： 1.Univ Queensland, Sch Agr & Food Sustainabil, Gatton 4343, Australia

2.Hainan Univ, Sanya Inst Breeding & Multiplicat, Sch Breeding & Multiplicat, Sanya 572025, Peoples R China

3.Chinese Acad Trop Agr Sci, Coconut Res Inst, Natl Key Lab Trop Crop Breeding, Wenchang 571339, Peoples R China

4.Univ Queensland, Ctr Hort Sci, Queensland Alliance Agr & Food Innovat QAAFI, Indooroopilly 4068, Australia

5.Saveetha Inst Med & Tech Sci SIMATS, Saveetha Sch Engn, Dept Bioengn, Chennai 602105, Tamil Nadu, India

关键词： coconut; acclimatization; seedlings; photomixotrophic growth

期刊名称：HORTICULTURAE （ 影响因子：3.0； 五年影响因子：3.2 ）

ISSN：

年卷期： 2025 年 11 卷 3 期

页码：

收录情况： SCI

摘要： Coconut (Cocos nucifera L.) is an important tropical palm globally, but due to declining production, it is failing to meet the rapidly increasing market demand. In vitro technologies, including embryo culture, cryopreservation, and clonal propagation, are being explored to increase productivity and to conserve unique varieties. Despite the development of these technologies, there is still a need to improve the acclimatization process used to produce the large numbers of high-quality coconut seedlings needed for planting. Enhancing seedling growth and development during acclimatization, using an elevated concentration of atmospheric carbon dioxide (CO2), and applying appropriate modifications to the light environment were the objectives of this study. A series of four semi-automated acclimatization chambers, which could control atmospheric CO2 concentration, relative humidity and temperature, and light intensity, quality, and photoperiod, were designed to undertake this study. An initial experiment demonstrated that a concentration of 1600 mu mol mol-1 CO2 in combination with an elevated light intensity of 600 mu mol m-2 s-1 could significantly enhance the growth and development of seedlings as compared to ambient CO2 concentrations and standard illumination conditions. Further experimentation demonstrated that continuous illumination with a combination of red and blue light (7:3) gave superior growth and development. This study found that the 6-month-old age is the ideal age for accelerating the acclimatization process using CO2. Overall, the maximum effectiveness of the photomixotrophic growth system was seen when CO2 (1600 mu mol mol-1) was applied to 6- to 7-month-old seedlings under a constant (24/0 h photoperiod) but elevated light intensity (600 mu mol m-2 s-1) of red and blue light in the ratio of 7:3.

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