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Plant Growth Regulation

, Volume 65, Issue 1, pp 35–45 | Cite as

Role of proline and glycinebetaine pretreatments in improving heat tolerance of sprouting sugarcane (Saccharum sp.) buds

  • Rizwan Rasheed
  • A. WahidEmail author
  • M. Farooq
  • Iqbal Hussain
  • Shahzad M. A. Basra
Original paper

Abstract

High temperature strongly hampers the plant growth particularly at early growth stages. In this study, changes in some physiological and anatomical characteristics and possibility of mitigating the adversities of heat stress by soaking sugarcane nodal buds in 20 mM proline and glycinebetaine (GB) solutions have been explored. Heat stress reduced the rate of bud sprouting nonetheless soaking the setts in proline followed by GB was beneficial. In addition, heat stress reduced the bud fresh and dry weights, generated H2O2, reduced the tissue levels of K+ and Ca2+, while increased the osmolytes synthesis in a time course manner. Heat stress also delayed the emergence and expansion of new bud leaves, by restricting the number and area of mesophyll cells. It also caused poor and aberrant development and diffused appearance of mesophyll cells and vascular bundles in the bud leaves. However, soaking of buds in proline and GB solutions substantially reduced the H2O2 production, improved the accumulation of soluble sugars and protected the developing tissues from heat stress effects; although proline was more effective than GB. Correlations of various attributes indicated that soaking in GB and proline restricted the H2O2 generation, improved K+ and Ca2+ contents, and increased the concentrations of free proline, GB and soluble sugars eventually improving the heat tolerance of buds. Cost-benefit analysis showed that, considering increase in sprouting of buds, soaking in 20 mM solution of both osmoprotectants is economical.

Keywords

Bud sprouting Glycinebetaine Heat stress Mesophyll cells Nutrients Sugarcane 

Notes

Acknowledgments

The financial support of Higher Education Commission (HEC), Islamabad, Pakistan under Indigenous Ph.D. Fellowship Program (5000 Fellowships) Batch-II to first author is acclaimed. Supply of sugarcane material by SRI, Faisalabad, Pakistan and microtomy and photography facilities by Prof. Ahrar Khan and Prof. Zargham Khan, Department of Pathology, University of Agriculture, Faisalabad, Pakistan are duly acknowledged.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Rizwan Rasheed
    • 1
    • 2
  • A. Wahid
    • 1
    Email author
  • M. Farooq
    • 3
  • Iqbal Hussain
    • 1
    • 2
  • Shahzad M. A. Basra
    • 4
  1. 1.Department of BotanyUniversity of AgricultureFaisalabadPakistan
  2. 2.Botany DepartmentGovernment College UniversityFaisalabadPakistan
  3. 3.Department of AgronomyUniversity of AgricultureFaisalabadPakistan
  4. 4.Department of Crop PhysiologyUniversity of AgricultureFaisalabadPakistan

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