THE EFFECTS OF WATER STRESS ON MORPHOLOGICAL AND PHYSIOLOGICAL CHARACTERISTICS OF THE CEREALS

Yıl 1995, Cilt: 4 Sayı: 1, - , 01.03.1995

Asuman Özer Bayram Sade

Öz

Water stress is the most important one of the several environmental factors affecting plants growth and development. The response of plants to stress depends on theirs genetic potential, stage of growth, morphology and yield potential and it causes important changes on morphological and physiological characteristics of the plants.

Root growth, root/shoot rate, the frequency of trichomes on leaf surfaces is increased, and a thick cuticle layer is formed by the effects of water stress on cereals. Transpiration, photosynthesis, protein synthesis, nitrate reduction activity and respiration decrease, abscisic acid (ABA) and ethylene production as a plant hormone, proline accumulation increase as a result of effect of water stress. Mechanisms such as stomatal closure or a reduction in leaf area, are effective in reducing water loss, but result in a loss in yield. Osmotic adjustment provides the potential for maintaining photosynthesis, as the water deficit increases.

Anahtar Kelimeler

Water stress; cereals; morphological

TAHILLARDA SU STRESİNİN BİTKİ MORFOLOJİSİ VE FİZYOLOJİSİ ÜZERİNE ETKİLERİ

Öz

Su stresi, bitkilerin büyüme ve gelişmelerini etkileyen önemli çevre faktörlerinden birisidir. Bitkilerin su stresine karşı responsu, onların genetik potansiyeli, gelişme dönemi, morfolojisi ve verim potansiyeline bağlı olup, bitkilerin morfolojik ve fizyolojik yapılarında önemli değişmelere sebep olur.

Su stresinin etkisi ile tahıllarda kök gelişimi hızlanır, kökün gövdeye oranı artar. Su stresine karşı respons olarak bitkide yaprakların üzeri sık tüylerle kaplanır. Yaprakların üzerinde kalın kütiküla tabakası oluşur. Transprasyon ve fotosentez azalır. Bitki bünyesindeki hormonlardan absisik asit (ABA) ve etilen üretimi artar, protein metabolizması bozulur. Prolin birikimi artar, nitrat indirgenme aktivitesi ve solunum azalır. Stomaların kapanması ve yaprak alanında azalma, bitkiler tarafından su kaybının azaltılmasında önemli olan mekanizmalardır. Fakat, bu durum verimin azalmasına sebep olur. Osmotik düzenleme ise, artan su noksanlığına bağlı olarak, bitkilerde fotosentezin konulmasında bir potansiyel sağlar.

Anahtar Kelimeler

Su stresi; tahıllar; morfoloji

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