Mehdi Oraei; Seyyed Jalal Tabatabaie; Esmaeil Fallahi; Ali Imani; Leila S. Fatemy
Abstract
Boron (B) toxicity is an important disorder that can limit plant growth in arid and semi-arid environments. It has been proven that use of tolerant rootstocks impede B uptake or transport to the aerial portions of plants. This may alleviate B toxicity in the scion, consequently improves the tolerance ...
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Boron (B) toxicity is an important disorder that can limit plant growth in arid and semi-arid environments. It has been proven that use of tolerant rootstocks impede B uptake or transport to the aerial portions of plants. This may alleviate B toxicity in the scion, consequently improves the tolerance to excess B in the root zone. An experiment was conducted to find the effects of B toxicity on vegetative growth, physiological characteristics and B distribution of almond tree (Prunus dulcis Mill.) cv. “Ferragnes” grown in the controlled environment. Three levels of B (0.25, 10, 20 mg/L) from H3BO3 and two almond rootstocks (GF677, Tuono) were factorially combined in a completely randomized design with four replications. The results showed that B toxicity had significant effects on vegetative growth, physiological characteristics and B distribution in almond tree. With increasing B levels in nutrient solution, vegetative characteristics including leaf production percentage and main shoot elongation was decreased significantly. However, Fr/Tuono was affected less than Fr/GF677. Also, physiological characteristics such as electrolyte leakage percentage, proline content and leaf necrosis percentage were increased significantly in two scion-rootstock combinations. On the basis of these results, GF677 because of an inability to restrict uptake and/ or transport of excess B from root system to aerial parts of scion, have a higher sensitivity to B toxicity. Instead, Tuono via mechanism of preferential distribution of B in roots inhibited the accumulation of high concentration of B either in young leaves or meristematic tissues partially and protected these susceptible organs against injury caused by B toxicity. In conclusion, it seem that under excess B conditions Tuono rootstock have higher tolerance than GF677.
Leila Seyed lor; Seyyed Jalal Tabatabaie; Esmaeil Fallahi
Abstract
Abstract
Silicon (Si) is considered one of the beneficial elements for plant, however recent studies show that Si plays an important role in plant resistance to environmental stresses , like salinity. An experiment was conducted to study the effect of Si and NaCl salinity on the growth, yield and ...
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Abstract
Silicon (Si) is considered one of the beneficial elements for plant, however recent studies show that Si plays an important role in plant resistance to environmental stresses , like salinity. An experiment was conducted to study the effect of Si and NaCl salinity on the growth, yield and fruit quality of strawberry (Fragaria × ananassa Duch) cv “selva” was grown hydroponically in the controlled environment glasshouse. Three levels of NaCl (0, 20 , 40 mM ) and three levels of Si ( 0, 1 , 2 mM ) was factorially combined in a completely randomized design with four replicates .The yield characteristics and fruit quality were measured during the experimental period. At the end of the experiment, plants were cut and vegetative characteristics such as number, fresh and dry weights and leaf area were measured. In addition, leaf relative water content and chlorophyll index were measured. The results showed that salinity reduced the vegetative characteristics, increasing the Si in the saline conditions, increased the number, fresh and dry weights and leaf area of the strawberry plants. The yield characteristics was reduced in the saline conditions, however applying Si reduced the adverse effects of salinity on the yield components. Both salinity and Si had no effect on the chlorophyll index. Leaf relative water content was reduced in salt stress, but silicon treatment largely improved relative water content of leaf. Both salinity and Si treatments increased acidity of fruit, but other quality characteristics were not affected by the treatments. The results reported here indicated that application of Si is recommend under salinity stress in strawberry.
Key words: Strawberry, Silicon, Salinity, Yield, Quality
