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  1. 2 Acta Physiologiae Plantarum

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  1. 2 Deligoz A.

  2. 1 Gur M.

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  1. 1 2015

  2. 1 2013

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1

Physiological and growth responses of Cedrus libani seedlings to cold storage

100%
Deligoz A.
Acta Physiologiae Plantarum
|
2013
|
tom 35
|
nr 02
The effects of cold storage duration on the physiological characteristics and growth of two-year-old Taurus cedar (Cedrus libani A. Rich) seedlings were studied. Taurus cedar seedlings were lifted in December, January and February and stored at ?4 C (cold storage) for 0, 2, 3 and 4 months. Xylem water potential (W), shoot (SMC) and root moisture (RMC) contents, root growth potential (RGP), root electrolyte leakage (REL) and total carbohydrate contents were determined before and after the cold storage. The survival and growth were also evaluated at the end of the first growing season. W, SMC and RMC, RGP and total carbohydrate contents were dramatically affected by the storage duration. The decrease in total carbohydrate contents during the storage showed a parallelism with RGP and survival. It was also found that storage duration had important effects on survival and growth. While survival was above 85 % even after storage of 4 months in seedlings that were lifted in December and January, this rate was reduced to 30 % after storage of 4 months in seedlings that were lifted in February. Total carbohydrate content and RGP can be used as an indicator of survival after cold storage.
2

Morphological, physiological and biochemical responses to drought stress of Stone pine (Pinus pinea L.) seedlings

63%
Deligoz A., Gur M.
Acta Physiologiae Plantarum
|
2015
|
tom 37
|
nr 11
In this study, the effect of irrigation intervals (drought stress) on growth, predawn xylem water potential (Ψw), the osmotic potential at full turgor (Ψπ100), the osmotic potential at the turgor loss point (ΨπTLP), osmotic adjustment and osmotic solutes (soluble sugars and proline) of Pinus pinea L. seedlings were examined. An experiment was carried out under greenhouse conditions using four watering treatments (control, 7-, 14- and 21-day irrigation intervals) in the first growth season; from mid-July to early November. Results showed that irrigation interval had significant effect on growth characteristics, Ψw, water relation parameters, and osmotic solutes. The increasing irrigation interval significantly decreased the seedling height, root collar diameter, root, stem and needle dry weight, number of lateral branches, root percentage, root:shoot ratio and diameter:height ratio. Ψw and total soluble sugars decreased while proline content increased with the increase of drought stress. The Ψπ100 and ΨπTLP significantly decreased in drought-stressed seedlings compared to control (no stress) seedlings. The results suggest that the impact of drought stress increased with the increase of irrigation interval. Therefore, in the drought-stressed P. pinea seedlings were indicated osmotic adjustment by increasing the proline content and decreasing Ψπ100 and ΨπTLP during drought stress. Growth decreased under drought stress conditions in P. pinea seedlings.
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