ISHS Acta Horticulturae 769: XXVII International Horticultural Congress - IHC2006: International Symposium on Asian Plants with Unique Horticultural Potential
STUDY OF PROLINE, SOLUBLE SUGAR, AND CHLOROPHYLL A AND B CHANGES IN NINE ASIAN AND ONE EUROPEAN PEAR CULTIVAR UNDER DROUGHT STRESS |
| Authors: | T. Javadi, K. Arzani, H. Ebrahimzadeh |
| Keywords: | water stress, Pyrus serotina, Pyrus communis, carbohydrates, amino acids |
| Abstract:
The effects of water stress on proline, soluble sugar and chlorophyll a and b in nine Asian and one European pear genotypes were studied. Asian pear genotypes were introduced to Iran by Dept. of Horticulture, Tarbiat Modarres University from Belgium in 1998. Asian pear genotypes were KS6, KS7, KS8, KS9, KS10, KS11, KS12, KS13, and KS14. Also a native European pear ‘Shah Miveh’ was used. All genotypes were planted in 20 L pots in which three irrigation treatments were applied, control, -0.5 MPa and -1.0 MPa, and the irrigations were applied when soil water potential reach -0.03, -0.5 and -1.0 MPa, respectively. A factorial experiment based on randomized complete block design was used. Proline accumulation increased in water stress treatments and was highest in KS14 compared with other genotypes. RWC decreased in drought stress treatments and was lower in ‘Shah Miveh’. Under drought stress conditions (-0.5 and -1.0 MPa), total soluble sugar (TSS) was accumulated in leaves. TSS accumulated at the beginning of stress period more than at the end of stress period. In general, TSS was highest in KS14 and lowest in KS9. In addition, chlorophyll a, b and total chlorophyll was reduced under drought stress conditions. Chlorophyll content in KS9 and KS6 genotypes was lowest among genotypes under drought conditions. | |
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