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The responses of stomatal parameters and SPAD value in Asian tobacco exposed to chromium

100%

Orcen N., Nazarian G., Gharibkhani M.

Polish Journal of Environmental Studies

2013

tom 22

nr 5

In this study, the responses of Asian tobacco varieties to chromium stress were investigated. To determine the responses arising from genotypic differences, Basma and Dubek varities were used. Basma was suitable for removing Cr from soil and was more tolerant than Dubek to chromium stress. A significant variation in stomatal characters, except for stomatal width, was observed in both varieties. In parallel with the increasing doses of Cr, stomata density significantly increased in both genotypes. Also, it was observed that stomatal length decreased with increases in Cr dosage. The increase in Cr concentration leads to decrease in SPAD value. It was observed that the SPAD value of Basma was more than Dubek in control plants. The correlation of stomatal parameters with each other and SPAD values were also calculated. A negative correlation was found between the SPAD value and stoma density in both varieties. Also, a positive correlation was observed between SPAD value and stomatal length. There was a significant negative correlation between stoma density and stomatal length.

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Modelling of the relationship between the SPAD values and photosynthetic pigments content in Quercus petraea and Prunus serotina leaves

100%

Bielinis E., Jozwiak W., Robakowski P.

Dendrobiology

2015

tom 73

In forest research and nursery practice there is often a need to monitor the condition and responses of trees to different stressors. Chlorophyll content in leaf is a good indicator of plant health and can be measured rapidly in many repetitions using the chlorophyll meter SPAD-502Plus. This practical tool provides the values of chlorophyll content in relative units (SPAD values), therefore it should be calibrated for each species to determine chlorophyll content in physiological units. In this study, the chlorophyll meter SPAD-502Plus was calibrated to be used for total chlorophyll (Chl), chlorophyll a (Chl a), chlorophyll b (Chl b) and carotenoids (Car) contents determination in leaves of Quercus petraea and Prunus serotina seedlings growing in different light environments. In the same leaf, SPAD values were measured with the Chl meter, and then photosynthetic pigments content (PP; chlorophyll and carotenoids) was consistently assessed using a conventional extraction method. The measurements were conducted once a month from May to November in three light treatments to obtain the widest possible range of the PP content values. To estimate total Chl content in leaves using the chlorophyll meter the quadratic polynomial functions: y = 0.0374x2 + 0.5345x + 0.5137 and y = 0.024x2 + 2.1998x – 32.7866 were obtained from the relationship between the Chl meter SPAD readings and total Chl determined spectrophotometrically for P. serotina and Q. petraea, respectively. Chl was higher under shade compared with full light regime and Car were linearly correlated with Chl. PP content was positively correlated with air temperature except for Car in P. serotina leaves. It was concluded that at the same soil conditions chlorophyll content in leaves of Q. petraea and P. serotina depended on species, light regimes and temperature of growth. The chlorophyll meter can be used as a practical tool to monitor and compare photosynthetic pigments content in leaves between tree species or populations acclimated to different environments together with a control of abiotic and biotic factors affecting pigments content and leaf optical properties.

Ograniczanie wyników

1 Dendrobiology

1 Polish Journal of Environmental Studies

1 Bielinis E.

1 Gharibkhani M.

1 Jozwiak W.

1 Nazarian G.

1 Orcen N.

1 Robakowski P.

1 2015

1 2013

Wyniki wyszukiwania

The responses of stomatal parameters and SPAD value in Asian tobacco exposed to chromium

Modelling of the relationship between the SPAD values and photosynthetic pigments content in Quercus petraea and Prunus serotina leaves