The Water Conductivity of the Graft Union in Apple Trees, with Special Reference to Malling Rootstock No. IX

Warne, L. G. G.; Raby, Joan

doi:10.1080/03683621.1938.11513526

Cited by 7 publications

(7 citation statements)

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“…One possible reason for geographical variability in disease incidence is genetic variation in susceptibility of the cultivars commonly grown in different areas. An opportunity to study variability in C. lanatus for reaction to Sphaerotheca fuliginia, the causal agent of powdery mildew in NY (10,16), was provided when 583 plant introductions and 7 domestic cultivars were exposed to natural infection in the greenhouse.…”

Section: Susceptibility To Powdery Mildew In Citrullus Lanatus (Thunb...mentioning

confidence: 99%

“…The conductivity of the graft union in various stock-scion combinations has been the subject of several investigations (2,12,15,16,17). The technique used was suction of water through cut stem segments of trees, including the zone of the graft union.…”

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confidence: 99%

“…The technique used was suction of water through cut stem segments of trees, including the zone of the graft union. As a rule, incompatible graft combinations showed an impeded water conductivity through the graft union (2,12), and with the dwarfing apple rootstock M 9 both the rootstock and the union were inefficient in water transfer (15,16,12). The disadvantage of this method is that it is not clear to what extent the results represent natural conditions in the living tree, as in the latter many vessels are normally filled with air and therefore inactive in the process of water transport (3).…”

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confidence: 99%

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The Water Conductivity of Defective Graft Unions in Pome and Stone Fruits1

Gur

Blum

1975

J. Amer. Soc. Hort. Sci.

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Using heat pulses the apparent velocity of the transpiration stream was measured in apple (Malus sylvestris Mill.) grafted on French seedlings (M. baccata Desf.), and several cultivars of peach (Prunus persica Sieb. and Zucc.) and Japanese plum (Prunus triflora Roxb.) grafted on almond (Prunus amvgdalus Batsch.) rootstock. The trees varied in compatibility with their respective rootstocks, as established by visual observation and gross morphology of the zone of union. Velocity of the transpiration stream was measured in 3 regions of each tree: the rootstock stem, the zone of union, and the scion stem. In definitely defective unions velocity of the transpiration stream in the zone of union exceeded that in both rootstock and scion. The possible use of this method as a tool for identifying poor graft unions in orchards is evaluated.

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Section: Susceptibility To Powdery Mildew In Citrullus Lanatus (Thunb...mentioning

confidence: 99%

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confidence: 99%

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The Water Conductivity of Defective Graft Unions in Pome and Stone Fruits1

Gur

Blum

1975

J. Amer. Soc. Hort. Sci.

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“…However, in most cases this is discounted as being the principal controlling factor, for if it were the case the two unions of the interstem should be more effective than the single union with a rootstock. Never theless, Warne and Raby (1939) reported that water con ductivity of the union with M IX was less efficient than the other Mailing stocks. Scholz (1957) concluded from anatomical studies of Clark Dwarf and standard varieties that the Clark Dwarf interstem posed a possible impediment to the transpira tion stream as compared with a standard interstem.…”

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confidence: 99%