Stomatal Density as a Selection Criterion for Developing Tea Varieties with High Physiological Efficiency

Document Type : Research Paper


1 Tocklai Tea Research Institute, Tea Research Association, Jorhat, Assam, India

2 Department of Plant Physiology and Breeding, Tocklai Tea Research Institute, Tea Research Association, Jorhat, Assam, India

3 Department of Plant Physiology and Breeding, Tocklai Tea Research Institute, Jorhat, Assam, India


Stomata, the small opening in leaf connecting plant with atmosphere, play pivotal roles in global water and carbon cycles. Stomata regulate the two key important physiological functions viz. photosynthesis and transpiration and thus are crucial for performance of crop species in changing climatic conditions. Although environmental factors influence the density and size of stomata, the genetic control of this character is evident. High variation for this character is reported from different crop species and thus improvement of this character is possible through appropriately designed breeding strategy. In tea, stomatal density varied from 44.67 mm-2 to 108 mm-2 and this character exhibited a significant and positive correlation with photosynthetic rate (Pn) and water use efficiency. A high value for heritability and genetic advance was detected for this character in tea, indicating its tight genetic control. Thus stomatal density may be an important selection criterion and development of physiologically efficient tea clones and seed varieties may be possible by improving stomatal density through a suitably designed breeding strategy.


Article Title [Persian]

تراکم روزنه به عنوان یک معیار گزینش برای تولید ارقام چای برخوردار از کارآیی فیزیولوژیکی بالا

Abstract [Persian]

روزنه­­ها باز شدگی­های کوچکی در محل اتصال گیاه با محیط هستند و نقش محوری در چرخه آب و کربن جهانی بازی می­کنند. روزنه­ها دو عمل فیزیولوژیکی مهم کلیدی، یعنی فتوسنتز و تعرق، را تنظیم می­نمایند و بنابراین، از نظر عملکرد گونه­های گیاهان زراعی به هنگام تغییر شرایط آب و هوایی از نقش حیاتی برخوردار هستند. اگرچه عوامل محیطی بر تراکم و اندازه روزنه­ها تاثیر می­گذارند، ولی کنترل ژنتیکی این صفت نیز به اثبات رسیده است. تنوع بالا برای این صفت در گونه­های گیاهی مختلف گزارش شده است و بنابراین بهبود آن از طریق طراحی یک استراتژی مناسب اصلاحی امکان­ پذیر است. در چای، تراکم روزنه­ها از 67/44 تا 108 عدد در یک میلی­متر مربع متغیر است و این صفت همبستگی معنی­دار و مثبت با میزان فتوسنتز (Pn) و کارآیی مصرف آب نشان داده­است. برای تراکم روزنه­ها در چای، وراثت پذیری و پیشبرد ژنتیکی بالا گزارش شده­است که نشان دهنده کنترل زیاد آن توسط عوامل ژنتیکی است. بنابراین، تراکم روزنه­­ها می­تواند به عنوان یک معیار گزینش مهم در نظر گرفته شود و در این راستا ایجاد کلون­های چای کارآمد از نظر فیزیولوژیکی و نیز ارقام بذری ممکن است از طریق بهبود تراکم روزنه­ها به کمک طراحی یک استراتژی اصلاحی مناسب، میسور شود.

Keywords [Persian]

  • تعرق
  • روزنه
  • فتوسنتز
  • کارآیی مصرف آب
  • وراثت پذیری
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