Su Kültüründe Yeti ştirilen Domates Lycopersicon esculentum Mill. Fidelerinin Çinko Dozlari ile Fosfor Beslenmesi/Fosfataz Enzirn Aktivitesi Aras ı ndaki Ilişki

Moneymaker domates Lycopeısicon esculentum MilL çeşidi, çinko dozlar ı na bağl ı olarak yapraklardaki ve kökteki fosforla fosfataz enzimi aras ı ndaki ilişkiyi incelemek amac ı yla 25 günlük süreyle kontrollu ı s ı tmal ı odalarda yetiştirilmiştir. Besin çözeltisine 0.05, 0.5, 1 ve 2 mg/L dozunda çinko ilave edilmi ştir. 2 mg/L uygulamas ı diğer uygulamalarla karşı laşt ı r ı ld ığı nda kuru ağı rl ı klarda azalmaya sebep olmu ştur ancak kuru ağı rl ı k bak ı m ı ndan diğer uygulamalar aras ı nda önemli farkl ı l ı k yoktur. Bitkideki çinko konsantrasyonu çinkonun art ı r ı lmas ı yla artm ış ve 2 mg/L çinko uygulamas ı yla zararl ı seviyeye ç ı kmışt ı r. Ancak yapraktaki P konsantrasyonu çinkonun art ış lyla azalm ış birlikte azalmalar olmu ş ve fosfor, 2mg/L çinko uygulamas ı nda yetersiz düzeye dü şmüştür. Kökteki P seviyesi çinko konsantrasyonun artmas ı yla birlikte artm ışt ı r. Fosfataz enzim aktivitesi en yüksek düzeye 2 mg/L çinko dozunda ulaşm ış , ancak enzim aktivitesi diğer uygulamalarda önemli derecede degismemistir

Anahtar Kelimeler:

Domates, çinko, fosfataz, su kültürü ve fosfor

Relationship Between Zinc Supply and Phosphorus Nutrition/ Phosphatase Enzyme Activity in a Hydroponically Grown Tomato Seedlings

Tomato Lycopersicon esculentum MIK cultivar Moneymaker, was grown hydroponically in controlled temperature C.T. room for 25 days to investigate relationships between phosphorus concentration in leaves and roots with phosphatase enzyme activity in relation to zinc supply. Zinc was added at concentrations of 0.05, 0.5, 1 and 2 mg/L in complete nutrient solution. The 2 mg/L zinc treatment resulted in a reduction in dry weights compared with other treatments, but there were no signifı cant differences in dry weights of seedlings between the other treatments. Zinc concentration in the plant increased with increasing zinc supply and reached a detrimental level with 2 mg/L Zn. However, there were signif ı cant decreases in P concentration in the leaves with increasing Zn supply and this decreased to an inadequate level in 2 mg/L Zn treatment. Phosphorus concentration in root increased with increasing Zn supply. Phosphatase enzyme activity was highest in the highest zinc treatment, with no significant differences in the activity in the other treatments.

Keywords:

Tomato, zinc, phosphatase, hydroponic and phosphorus,

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