EFFECTS OF WALNUT SEEDLING VIGOR ON ROOT PRESSURE, GRAFTING SUCCESS, AND SCION GROWTH

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REZAEI REZA; GRIGORIAN W.; VAHDATI K.; VALIZADEH MOSTAFA

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Journal: IRANIAN JOURNAL OF HORTICULTURAL SCIENCE AND TECHNOLOGY Year:2007 | Volume:8 | Issue:1 Page(s): 21-30

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Title

EFFECTS OF WALNUT SEEDLING VIGOR ON ROOT PRESSURE, GRAFTING SUCCESS, AND SCION GROWTH

Author(s)

REZAEI REZA | GRIGORIAN W. | VAHDATI K. | VALIZADEH MOSTAFA | Issue Writer Certificate

Keywords

JUGLANS REGIA L.Q3

SAP FLOWQ3

TREE SIZEQ3

VEGETATIVE PROPAGATIONQ3

Abstract

High rate of root pressure is one of the main reasons of walnut grafting failure at early spring. In this experiment the effects of factorial combination of three seedlings vigor and three methods of root pressure control was investigated on the SAP FLOW rate (SFR), grafting success percentage (GSP) and scion growth, in a completely randomized design with three replications. The effect of seedling vigor on the SFR trends and its correlation with the environmental variables during a 4-week period was studied as a separate experiment. According to the results, the SFR was similar for all of three groups of seedlings at the first week but, the trend of SFR was significantly separated during later weeks of measurements, so that it was decreased significantly in the case of low vigorous seedlings as compared to the vigorous and medium-vigorous seedlings (P<0.01). Also the rate of SAP FLOW showed a positive correlation (r=0.98) with the minimum temperature of a day before of its measurement. The relatively late decline of SFR in low vigor seedlings did not significantly affect the GSP, but in combination with the one week of grafting delay resulted to the non-significant increase in the GSP as compared to vigorous seedlings (P<0.01). In addition, covering graft union with moist sawdust as well as grafting delay for one week resulted to the highest GSP (80-90%) independently from the seedling vigor. The growth rate of scions 45 days after grafting was affected significantly by the seedlings vigor (P<0.05). Thus, by controlling the root pressure via delay in grafting time and covering graft union by moist sawdust or avoiding usage of very vigorous seedlings of forest walnut ecotypes in the nurseries, it could be possible to obtain about 90% of GSP as well as a relatively significant reduction of scion growth.

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APA: Copy

REZAEI, REZA, GRIGORIAN, W., VAHDATI, K., & VALIZADEH, MOSTAFA. (2007). EFFECTS OF WALNUT SEEDLING VIGOR ON ROOT PRESSURE, GRAFTING SUCCESS, AND SCION GROWTH. IRANIAN JOURNAL OF HORTICULTURAL SCIENCE AND TECHNOLOGY, 8(1), 21-30. SID. https://sid.ir/paper/80814/en

Vancouver: Copy

REZAEI REZA, GRIGORIAN W., VAHDATI K., VALIZADEH MOSTAFA. EFFECTS OF WALNUT SEEDLING VIGOR ON ROOT PRESSURE, GRAFTING SUCCESS, AND SCION GROWTH. IRANIAN JOURNAL OF HORTICULTURAL SCIENCE AND TECHNOLOGY[Internet]. 2007;8(1):21-30. Available from: https://sid.ir/paper/80814/en

IEEE: Copy

REZA REZAEI, W. GRIGORIAN, K. VAHDATI, and MOSTAFA VALIZADEH, “EFFECTS OF WALNUT SEEDLING VIGOR ON ROOT PRESSURE, GRAFTING SUCCESS, AND SCION GROWTH,” IRANIAN JOURNAL OF HORTICULTURAL SCIENCE AND TECHNOLOGY, vol. 8, no. 1, pp. 21–30, 2007, [Online]. Available: https://sid.ir/paper/80814/en

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