Semizotunun (Portulaca oleracea L.) bor toksititesine tepkisi

Year 2016, Volume: 31 Issue: 3, 448 - 455, 24.10.2016

Halil Samet Yakup Çıkılı

https://doi.org/10.7161/omuanajas.270000

Cited By: 2

Abstract

Bu çalışma, semizotu bitkisinde (Portulaca oleraceae L.) artan bor (B) düzeylerinin etkisini belirlemek için yapılmıştır. İki semizotu türü, Mercan (yaygın bir şekilde yetiştirilen bir tür) ve Yabani (doğada kendiliğinden yetişen bir tür) sera denemesi için kullanılmış ve 0, 5, 10, 25 mg kg-1 B düzeyleri uygulanmıştır. Bor stresi altındaki bitkilerde bitki gelişmesi, toplam klorofil (Chl) ve karotenoid (Car) önemli derecede düşmüştür. Yabani çeşidin toplam Chl ve Car içerikleri Mercan çeşidinden fazla bulunmuştur. Artan B uygulamalarıyla her iki semizotu çeşidinde de, gövde kök oranı (SRR) ve membran geçirgenliği (MP) artarken, oransal su içeriği (RWC) dalgalı bir seyir izlemiştir. Ayrıca, kök ve gövdede bulunan B elementinin içerik ve alımları, kökteki en yüksek B düzeyi hariç, artan B düzeylerine paralel olarak artmıştır. Her iki çeşitte de fosfor (P) ve potasyum (K) alımları artan B düzeyleri ile düşerken, kalsiyum (Ca) alımı bir dalgalanma göstermiştir. Sodyum (Na) alımı Mercan çeşidinde artmış, yabani çeşitte ise düşmüştür. Fosfor ve potasyum alımları Mercan çeşidinde daha fazladır. Oysa kalsiyum ve sodyum alımları yabani çeşitte daha fazladır. Semizotu bitkisinin artan B düzeylerine farklı tepkiler gösterdiği ve Mercan çeşidindeki biokütle üretiminin yabani çeşitten daha fazla olduğu sonucuna varılmıştır.

Keywords

Bor toksisitesi, besin alımları; bitki gelişimi; Portulaca oleraceae; semiz

Response of purslane (Portulaca oleracea L.) to boron toxicity

Abstract

This study was undertaken to determine the effects of increasing boron (B) in purslane (Portulaca oleraceae L.). Two variety of purslane, Mercan (a variety cultivated widely) and Wild (a variety grown in nature spontaneously), were used for glasshouse experiment with the following treatments: 0, 5, 10, 25 mg B kg-1. Plant growth, total chlorophyll (Chl) and carotenoid (Car) reduced significantly in B-stressed plants. Total Chl and Car contents in Wild were greater than in Mercan. While shoot and root ratio (SRR) and membrane permeability (MP) were increased by applied B, relative water content (RWC) showed an indecisive trend in both varieties. Also, the content and uptake of B in shoot and root increased in parallel to increasing B levels, except for the highest B level in root. While uptakes of phosphorus (P) and potassium (K) decreased with increasing B levels, Calcium (Ca) uptake showed an indecisive trend in both varieties. Na uptakes increased in Mercan, whereas it decreased in Wild. The P and K uptakes were greater in Mercan, whereas the Ca and Na uptakes were greater in Wild. It was concluded that purslane showed different responses to increasing B levels and biomass production was greater in Mercan than in Wild.

Keywords

Boron toxicity, nutrient uptake; plant growth; Portulaca oleraceae; purslane

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