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Showing 2 results for Chlorophyll Fluorescence
Effects of iron on efficiency and map of photosystem II photochemical yield of rose flower using chlorophyll fluorescence imaging
Sh. Kiani,
Volume 2, Issue 4 (2-2012)
Abstract
Interveinal chlorosis induced by iron deficiency is considered to be one of the problems in rose production in greenhouses all over the world. This experiment was conducted to elucidate the capability of chlorophyll fluorescence imaging technique to recognize early iron deficiency and also determination of relationship between leaf iron concentration and leaf chlorophyll content index and photosystem II photochemical efficiency of rose flower (Rosa hybrida L., cv. First Red). Rose plants were grown and subjected to 5 levels of iron (1.5, 3, 6, 12 and 24 μM) based on randomized complete blocks design with 4 replicates in hydroponic greenhouse of Wageningen University, The Netherlands. The results revealed that increased concentration of iron in nutrient solution from 1.5 to 24 μM led to the meaningful increase of average photosystem II photochemical efficiency from 0.062 to 0.590 (P<0.01). This was clearly obvious in the map of photosystem II photochemical yield of rose leaves. The results indicated significant (P<0.05) correlations between leaf iron concentration and leaf chlorophyll content index (r= 0.91) and average photosystem II photochemical efficiency (r= 0.85). Also, a significant correlation (P<0.05) was found between leaf chlorophyll content index and photosystem II photochemical efficiency (r=0.86). The results clearly demonstrated that it is possible to detect early hidden hunger of iron in rose flower with the use of chlorophyll fluorescence imaging and therefore increasing the yield and quality of rose flower in greenhouses.
Effect of different planting substrates on vegetative and physiologic characteristics and nutrients content of rose (Rosa hybrida var. Grandgala) in hydroponic system
H. R. Roosta, V. Bagheri, H. Kian,
Volume 7, Issue 4 (1-2017)
Abstract

Rose is one of the most important flowers in the world, and is ranked first in the market of cutting flowers. An experiment was carried out to study the effects of different planting substrate on the quality and quantity of rose (Rosa hybrida var. Grandgala) flower. In this experiment, one-year-old rooted cuttings of commercial rose cv. Grandgala were transferred into different growing media including: 25% perlite + 75% cocopeat, 50% perlite+ 50% cocopeat, 75% perlite+ 25% cocopeat, and washed sand, and nourished by one-half Hoagland’s solution, with pH of 6.5, for six months. In this study, effects of different planting media on different characteristics such as vegetative growth, photosynthetic parameters and nutrients were investigated. Results showed that planting media influenced all studied factors and differences between the four medium were clearly visible. Plants grown in medium with 25% perlite+ 75% cocopeat had the highest increase in growth photosynthetic parameters, and nutrients’ concentration as compared to other treatments. For example, increasing the percentage of cocopeat caused an increase in the number of buds on the plant. Number of buds in 25% perlite+ 75% cocopeat treatment increased 36% over washed-sand treatment. Also, the highest photochemical quantum yield of PS II photochemistry (Fv/Fm) was observed in 25% perlite+ 75% cocopeat treatment and the lowest Fv/Fm (0.724) in the plants grown in 75% perlite+25% cocopeat, respectively. According to the results, mixture of 25% perlite+ 75% cocopeat substrate was a suitable medium for hydroponic cultivation of rose var. Grandgala.


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