EFFECTS OF SOAKING ON THE GERMINATION CHARACTERISTICS AND MINERAL LEAKAGE OF COTTON (GOSSYPIUM HIRSUTUM L.) SEED
Mar 10, 2017

Agronomy & physiology WCRC Agro-phyisio-Med-MiddleEast WCRC1
Abstract                                                                         Back to Table of contents

Cotton seed (Gossypium hirsutum  L.) was tested to identify germination, seedling characteristics and growth as well as mineral leakage caused by soaking the seeds for different periods. Four cotton cultivars (BL. 644, Ç. 1518, DP. 299 and Sayar 314) were used with five different soaking periods (0, 4, 8, 16 and 24 hours).  Germination and seedling characteristics were tested in a growth cabinet at 25 ˚C.  The highest germination percentages were observed in all cotton cultivars with four and eight hours soaking, while the greatest abnormal seedlings were noted with 24 hours soaking.  Coleoptile and mesocotyl elongation and length were decreased with 24 hour treatments.  Vigour indices were decreased also with 24 hour soaking in all cultivars.  The leakage of K, P, Mn, Ca, Cu, Fe, and Zn mineral ions was increased significantly with 24 hour treatments.  The leakage of K+ and Ca++ ions was significantly correlated with the seed germination.  Zn++ was leaked less than other ions but the leakage of Zn++ was stable during other soaking periods.  Variation in seed mineral leakage was observed among the four cotton cultivars.

Conclusions

 These results indicate that soaking treatments of 4 to 6h in distilled water was helpful for better germination of cotton seeds and seedling establishment. Increasing soaking periods reduced germination. Soaked cotton seeds had leakages of K+ and Ca2+ cations, as well as Mn2+, Fe2+ and Cu2+. Similar conclusions were reported by Woodstock and Grabe (1967), Anderson et al. (1964), Cantrell, et al. (1972) and Woodstock et al. (1985).

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