Sensitivity to boron stress in growing media during the early seedlings stage could severely inhibit watermelon growth and development. The aim of this study was to test if watermelon(Citrullus lanatus cv. Mahbubi) pe...Sensitivity to boron stress in growing media during the early seedlings stage could severely inhibit watermelon growth and development. The aim of this study was to test if watermelon(Citrullus lanatus cv. Mahbubi) performance can be improved under different boron concentrations(0, 46.31 and 935.11 μmol·L-1 H3BO3) by grafting watermelon plants onto Cucurbita pepo Tiana F1 hybrid rootstock. Shoot dry weight of grafted watermelon was significantly higher than those of non-grafted plants under boron stress conditions(0 and 935.11 μmol·L-1). Boron concentration of the aerial organs of the grafted plants was higher than in the non-grafted ones when treated with 0 μmol·L-1 H3BO3. However, with the application of boron(935.11 μmol·L-1 H3BO3), the aerial organs of grafted plants accumulated lower boron than non-grafted ones. The Cucurbita pepo rootstock also improved the absorption of several other nutrients and leaf chlorophyll content and the Fv/Fmratio was also increased at high boron root concentration. Higher activities of several antioxidant enzymes such as catalase(CAT), superoxide dismutase(SOD) and peroxidase(POX) in grafted watermelons were associated with a significant reduction in H2O2 and malondialdehyde(MDA) generation when compared with those of non-grafted plants under boron stress conditions(0 and 935.11 μmol·L-1 H3BO3). Grafted plants reported improved growth, nutrient uptake and several other physiological parameters when compared to non-grafted watermelon plants under boron stress conditions.展开更多
This research investigated physiological and biochemical changes at rootstock–scion union of graft combinations between Iranian rootstocks and Asgari scion in response to NAA and BAP application.Grafting cuts of scio...This research investigated physiological and biochemical changes at rootstock–scion union of graft combinations between Iranian rootstocks and Asgari scion in response to NAA and BAP application.Grafting cuts of scion and rootstock were dipped into NAA(0,200 and 400 mg·L^(-1))and BAP(0,250 and 500 mg·L^(-1))solutions for 30 min,immediately after the cuttings were grafted using the wedge grafting technique.The highest successful grafting rate(82%)was recorded with Asgari–Asgari combination treated with 200 mg·L^(-1) NAA+500 mg·L^(-1) BAP.Treating the graft cut–surfaces with 200 mg·L^(-1) NAA+500 mg·L^(-1) BAP caused the lowest H 2 O 2 and MDA contents.Among all the graft combinations,the highest increase in chlorophyll content with a high photosynthesis efficiency occurred in Asgari–Shahani when treated with 200 mg·L^(-1)NAA+500 mg·L^(-1) BAP.The graft union formation in the presence of 200 mg·L^(-1) NAA+500 mg·L^(-1) BAP application enhanced CAT and POX activities.In conclusion,treatment of graft zone with 200 mg·L^(-1) NAA+500 mg·L^(-1) BAP enhanced antioxidant activities and reduced lipid peroxidation in scion leaves.However,several grapevine rootstocks tested in our research were also impacting the scion performance.展开更多
文摘Sensitivity to boron stress in growing media during the early seedlings stage could severely inhibit watermelon growth and development. The aim of this study was to test if watermelon(Citrullus lanatus cv. Mahbubi) performance can be improved under different boron concentrations(0, 46.31 and 935.11 μmol·L-1 H3BO3) by grafting watermelon plants onto Cucurbita pepo Tiana F1 hybrid rootstock. Shoot dry weight of grafted watermelon was significantly higher than those of non-grafted plants under boron stress conditions(0 and 935.11 μmol·L-1). Boron concentration of the aerial organs of the grafted plants was higher than in the non-grafted ones when treated with 0 μmol·L-1 H3BO3. However, with the application of boron(935.11 μmol·L-1 H3BO3), the aerial organs of grafted plants accumulated lower boron than non-grafted ones. The Cucurbita pepo rootstock also improved the absorption of several other nutrients and leaf chlorophyll content and the Fv/Fmratio was also increased at high boron root concentration. Higher activities of several antioxidant enzymes such as catalase(CAT), superoxide dismutase(SOD) and peroxidase(POX) in grafted watermelons were associated with a significant reduction in H2O2 and malondialdehyde(MDA) generation when compared with those of non-grafted plants under boron stress conditions(0 and 935.11 μmol·L-1 H3BO3). Grafted plants reported improved growth, nutrient uptake and several other physiological parameters when compared to non-grafted watermelon plants under boron stress conditions.
文摘This research investigated physiological and biochemical changes at rootstock–scion union of graft combinations between Iranian rootstocks and Asgari scion in response to NAA and BAP application.Grafting cuts of scion and rootstock were dipped into NAA(0,200 and 400 mg·L^(-1))and BAP(0,250 and 500 mg·L^(-1))solutions for 30 min,immediately after the cuttings were grafted using the wedge grafting technique.The highest successful grafting rate(82%)was recorded with Asgari–Asgari combination treated with 200 mg·L^(-1) NAA+500 mg·L^(-1) BAP.Treating the graft cut–surfaces with 200 mg·L^(-1) NAA+500 mg·L^(-1) BAP caused the lowest H 2 O 2 and MDA contents.Among all the graft combinations,the highest increase in chlorophyll content with a high photosynthesis efficiency occurred in Asgari–Shahani when treated with 200 mg·L^(-1)NAA+500 mg·L^(-1) BAP.The graft union formation in the presence of 200 mg·L^(-1) NAA+500 mg·L^(-1) BAP application enhanced CAT and POX activities.In conclusion,treatment of graft zone with 200 mg·L^(-1) NAA+500 mg·L^(-1) BAP enhanced antioxidant activities and reduced lipid peroxidation in scion leaves.However,several grapevine rootstocks tested in our research were also impacting the scion performance.
