Abstract
Effects of soil drought on crop yield of 4 strains and 7 cultivars of spring triticale was investigated under field condition. The Drought Susceptibility Index (DSI) was evaluated in a two year experiment by the determination of grain loss in conditions of two soil moisture levels (drought-D and irrigated-IR). In the experiment response to drought was evaluated by different screening tests (leaf gaseous exchange, leaf water potential, chlorophyll content and fluorescence, leaf injury by drought and by simulated drought and heat temperature and water loss by excited leaf. The DSI values and the results of screening tests showed the genetic variation in the degree of drought tolerance. The values of DSI enabled the ranking of the tested triticale genotypes with respect to their drought tolerance and allow to divide them into three groups of drought susceptibility. Large differences among studied forms were observed also in changes of leaf water potential, fluorescence and leaf injury. For plants in vegetative stage of growth the tested breeding forms were easily separated into groups of different drought tolerance. Changes of ψ, Fv/Fm and LI as a screening tests were the most suitable techniques for estimation of degree of drought tolerance for triticale. Laboratory screening tests (leaf injury by simulated drought (LIDS) and high temperature (LIHT) and water loss (WL) of excited leaf conducted for nonstressed plants in most cases were significantly correlated with DSI. The statistically significant correlation between leaf water potential (ψ) was observed only with leaf fluorescence (Fv/Fm). Changes of Fv/Fm were significantly correlated with ψ, LI and LIHT for 50 °C. Index of leaf injury (LI) by soil drought were significantly correlated with Fv/Fm, LIDS (−1.0, −1.5 MPa), LIHT (45 and 50°C) and water loss (WL). The correlation coefficient between the tests LIDS and LIHT were most of the considered cases statistically significant which indicate that the mechanism of membranes injury resulted from simulated drought or high temperature were similar in triticale. Water loss (WL) of excited leaves was the most suitable test for screening drought tolerance in triticale population. Changes of gaseous exchange parameters were not useful as screening test in this research.
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Abbreviations
- DSI:
-
Drought Susceptibility Index
- K:
-
Hydrothermal index
- CV:
-
coefficient of variation
- P:
-
net photosynthesis rate
- E:
-
transpiration rate
- CO2int :
-
internal CO2 concentration
- C:
-
stomatal conductance rate
- Ψ:
-
leaf water potential
- Fv/Fm:
-
maximal quantum yield of PS II (chlorophyll fluorescences)
- Chl a+b:
-
chlrorophyll a+b content
- LI:
-
leaf injury
- LIDS :
-
leaf injury by simulated drought
- LIHT :
-
leaf injury by high temperature
- WL:
-
water loss excited leaves.
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Grzesiak, S., Grzesiak, M.T., Filek, W. et al. Evaluation of physiological screening tests for breeding drought resistant triticale (x Triticosecale wittmack). Acta Physiol Plant 25, 29–37 (2003). https://doi.org/10.1007/s11738-003-0033-0
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DOI: https://doi.org/10.1007/s11738-003-0033-0