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Effects of plant growth regulators on growth and carbohydrate accumulation in shoots and roots of two almond rootstock seedlings

Published online by Cambridge University Press:  29 November 2008

Mostafa Mobli  and
Bahram Baninasab
Mostafa Mobli
Affiliation:
Dep. Hortic., Coll. Agric., Isfahan Univ. Technol., Isfahan 84156-83111, Iran
Bahram Baninasab
Affiliation:
Dep. Hortic., Coll. Agric., Isfahan Univ. Technol., Isfahan 84156-83111, Iran
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Abstract

Introduction. Prunus amygdalus and P. webbii can be used as rootstocks for almond cultivars due to their adaptability to severe environmental conditions. However, the time required for seedlings to reach a suitable size for transplanting may take 1 to 3 years. Our study tested the effects of foliar application of growth regulators on the vegetative growth and carbohydrate accumulation in shoots and roots of these species. Materials and methods. Six-week-old seedlings were treated with gibberellic acid (GA3) (100 mg·L–1) alone or with GA3 followed by ethephon [(100 and 200) mg·L–1], or chlormequat chloride (CCC) [(500 and 1000) mg·L–1], or paclobutrazol (PBZ) [(500 and 1000) mg·L–1]. Results and discussion. Most levels of plant growth regulators significantly enhanced seedling growth. However, GA3 alone was most effective on stem height, leaf area, and shoot fresh and dry weights of both almond species. The thickest stems of P. amygdalus and P. webbii were obtained from the application of 100 mg GA3·L–1 followed by application of (1000 and 500) mg PBZ·L–1, respectively. In both species, PBZ significantly increased leaf chlorophyll content compared with the controls as well as with the other treatments. Application of GA3 alone on P. webbii and of GA3 followed by 100 mg ethephon·L–1 on P. amygdalus showed the highest root number, and root fresh and dry weights. High levels of soluble sugars and starch in the shoots and roots of both species were observed when GA3 application was followed by PBZ. Conclusion. These results demonstrated that application of plant growth regulators to the seedlings might be a useful way of enhancing growth of P. amygdalus and P. webbii and reducing the time and cost of seedling production.

Keywords

Iran Islamic RepublicPrunus amygdalusPrunus webbiirootstocksseedlingsgrowthplant growth substancesgibberellic acidethephonchlormequatpaclobutrazolIran République islamiquePrunus amygdalusPrunus webbiiporte greffeplantulecroissancesubstance de croissance végétaleacide gibbérelliqueéthéphonchlorméquatpaclobutrazol
Type
Research Article
Information
Fruits , Volume 63 , Issue 6 , November 2008 , pp. 363 - 370
Copyright
© CIRAD, EDP Sciences, 2008

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