Erdal ELKOCA

Ozmo- ve hidropriming uygulamalarının bezelye (Pisum sativum L. cv. Winner) tohumlarının çimlenme performansı ve termal zaman ihtiyacı üzerine etkisi

Çeşitli priming uygulamalarının ve priming uygulamasürelerinin bezelye (Pisum sativum L. cv. Winner)tohumlarının çimlenme performansı üzerindeki etkisiaraştırılmıştır. Tohumlar ozmopriming uygulamasındapolietilen glikol (PEG 6000) (-0.5, -1.0 ve -1.5 bar) veyamannitol (%1, %2 ve %3) solüsyonunda; hidropriminguygulamasında ise su içerisinde 12 veya 24 saat süreyleolmak üzere 25 °C de karanlık koşullardabekletilmişlerdir. Priming uygulanmış tohumlar 5 ile 32± 0.5 °C arasında değişen on farklı sıcaklık derecesindeçimlenme testlerine alınmışlardır. Priming uygulamalarıçimlenme oranı üzerine önemli etkide bulunmamıştır.Ancak, ozmo- ve hidropriming uygulamaları çimlenmehızını artırıp termal zaman ihtiyacını önemli seviyedeazaltmış ve ayrıca test edilen bazı sıcaklık derecelerindeeş zamanlı çimlenmeyi teşvik etmiştir. Uygulamalarabağlı olarak, termal zaman ihtiyacındaki azalma %10,%50 ve %90 çimlenme için sırasıyla 3.4 °C gün ile 11.3°C gün, 6.6 °C gün ile 17.4 °C gün ve 11.6 °C gün ile 27.5°C gün arasında değişmiştir. Priming uygulama süresinin12 saatten 24 saate uzatılması, %50 çimlenme zamanı vetermal zaman ihtiyacı üzerine çoğunlukla olumsuz etkiyapmıştır. En iyi sonuçlar -0.5 bar PEG, %1 mannitol vesu (hidropriming) uygulanmış tohumlardan elde edilmişve 12 saat süreyle bezelye tohuma yapılacak buuygulamaların daha iyi bir çimlenme için tavsiyeedilebileceği kanısına varılmıştır.

Osmo- and hydropriming enhance germination rate and reduce thermal time requirement of pea ( Pisum sativum L. cv. Winner) seeds

The effects of various seed priming treatments andseed soaking durations on germination performance ofpea (Pisum sativum L. cv. Winner) seeds wereexamined. Seeds were osmoprimed in polyethyleneglycol (PEG 6000) (-0.5, -1.0 and -1.5 bar) or inmannitol (1%, 2% and 3%) and hydroprimed withwater for 12 or 24 h at 25 ± 0.5 °C in darkness. Primedseeds were subjected to germination tests at tendifferent constant temperatures ranging from 5 to 32 ±0.5 °C. Priming treatments had no significant effect ongermination percentage. But, osmo- and hydroprimigtreatments improved germination rate and decreasedthermal time requirements significantly and inducedmore synchronous germination at some of thetemperatures tested. Reductions in thermal timerequirements ranged between 3.4 °C d and 11.3 °C d,6.6 °C d and 17.4 °C d, and 11.6 °C d and 27.5 °C d for10%, 50% and 90% germination, respectively. Ascompared with the priming duration of 12 h, primingduration of 24 h had generally negative effect on the50% germination time and thermal time requirement.Among the osmopriming treatments, seeds treatedwith -0.5 bar solution of PEG and 1% solution ofmannitol, and also hyropriming gave the best results.Consequently, above osmo- and hydroprimingtreatments for 12 h might be recommended for bettergermination of pea.

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