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Germination, seedling
growth and relative water content of shoot in different seed
sizes of triticale under osmotic stress of water and NaCl
Digdem Kaydan
and Mehmet Yagmur*
Yüzüncü
Yıl University, Faculty of Agric., Department of Field
Crops, 65080 VAN-Turkey.
*Corresponding author. E-mail:
myagmur@yyu.edu.tr.
Accepted
10 July, 2008 |
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Effect
of seed size (small, medium and large) on germination and
seedling growth of triticale (xTriticosecale Witm. cv.
Presto) at the different osmotic potential of NaCl and PEG
solutions were determined in the present study. Germination
tests were conducted under five osmotic potential levels
(-0.45, -0.77, -1.03, -1.44 MPa, and Control) of PEG 6000
and NaCl. Germination percentage (%) at 4 and 8th
days and also seedling growth traits such as root and shoot
length (mm), dry root and shoot weight (mg), root : shoot
length (R:S) ratio, and relative water content of shoot (RWC,
%) were investigated in this study. The results indicated
that decreases in the osmotic potentials caused a reduction
in germination percentage and seedling growth. It was seen
that drought created by PEG 6000 had more negative effects
on germination and seedling growth than that of NaCl. In
consequence, the total germinability and seedling growth
were higher in large seeds rather than in small seeds in
control solution and under osmotic stress. In addition, it
was observed that seedlings obtained from larger seeds
survived even at the lower osmotic potential of PEG and NaCl;
whereas, seedling obtained from small seeds did not survive
in the intensive stress.
Key
words:
xTriticosecale Witm, seed size, drought, germination,
seedling growth. |
