Responses of Apple Plants to Salinity Stress

Abstract

Salt stress is a common agricultural problem that affects both quantity and quality of fruit crops. Responses of rootstocks against salinity possess importance due to demonstrating stress tolerance. Little is known about the early responses of apple plants to short term salinity. In our study, we investigated the physiological responses of an apple plant cv Fuji grafted onto M9 and MM106 rootstocks against 35 mM NaCl stress. After 1 month, salt-treated plants exhibited decreased chlorophyll content (SPAD). Salt stress decreased stomatal conductance values of Fuji/M9 and Fuji/MM106 by 17.0 and 30.1%, respectively when compared with own control. Membrane permeability decreased by 21.3 and 22.0% in salt-treated Fuji/M9 and Fuji/MM106, respectively compared with own control. Reduction due to salt stress in SPAD value, stomatal conductance and leaf relative water content and increase in leaf temperature and membrane permeability were greater in Fuji/MM106 than in Fuji/M9, suggesting that under short term salinity toxic effects of  NaCl were less in Fuji/M9.

Keywords

• Rootstock,Malus,Response,Salinity

Elma Bitkilerinin Tuz Stresine Tepkileri

Öz

Tuz stresi meyve verim ve kalitesini etkileyen önemli bir tarım sorunudur. Tuzluluğa karşı anaçların tepkisi strese karşı toleransı sergilediğinden dolayı büyük bir önem arz etmektedir. Elma bitkisinin kısa dönemli tuzluluğa etkileri hakkında fazla bir bilgi bulunmamaktadır. Çalışmamızda, M9 ve MM106 anaçlarına aşılı Fuji elma çeşidinin 35 mM NaCl stresine verdiği fizyolojik tepkiler araştırılmıştır. Bir ay sonra, tuz uygulanan bitkilerde düşük klorofil içeriği (SPAD) görülmüştür. Tuz stresi stoma iletkenliğini Fuji/M9 ve Fuji/MM106’ da kontrol bitkilerine kıyasla sırasıyla % 17.0 ve 30.1 oranında azaltmıştır. Membran geçirgenliği tuz uygulanan Fuji/M9 ve Fuji/MM106’ da kontrol bitkilerine kıyasla sırasıyla % 21.3 ve 22.0 oranında azalmıştır. Tuz stresinden dolayı SPAD değerinde, stoma iletkenliğinde ve yaprak oransal su içeriğinde azalma ve yaprak sıcaklığı ve membran geçirgenliğindeki artış Fuji/M9’ a kıyasla Fuji/MM106’ da daha yüksek görülmüş olup, kısa dönemli tuzluluğun toksik etkileri Fuji/M9’da daha az görülmüştür.

Anahtar Kelimeler

• Malus,Anaç,Tepki,Tuzluluk

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