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Whole-Plant Physiology of Grafted Tomato and Watermelon Plants for Optimized Nutrient Management /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Whole-Plant Physiology of Grafted Tomato and Watermelon Plants for Optimized Nutrient Management // Jason Hollick.
作者:	Hollick, Jason,
面頁冊數:	1 electronic resource (278 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
Contained By:	Dissertations Abstracts International86-11B.
標題:	Horticulture. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=32111897
ISBN:	9798314890554

Whole-Plant Physiology of Grafted Tomato and Watermelon Plants for Optimized Nutrient Management /
Hollick, Jason,

Whole-Plant Physiology of Grafted Tomato and Watermelon Plants for Optimized Nutrient Management /Jason Hollick. - 1 electronic resource (278 pages)

Source: Dissertations Abstracts International, Volume: 86-11, Section: B.

Combining genotypes through grafting allows the rapid adaptation of crops like tomato and watermelon to challenges including soilborne disease and abiotic stress. Despite these benefits, under ideal growing conditions, grafted plants do not always generate sufficient yield to justify their extra cost. Therefore, I conducted research to better understand the factors affecting grafted plant's yield, with focus on plant vigor and reproductive development in tomato and watermelon.In tomato, grafting is often performed with the goal of increasing plant vigor and yield, however the degree of this vigor depends on the specific pairing of scion and rootstock. To identify rootstock and scion contributions to whole plant vigor, vegetative growth parameters and plant tissue nutrient concentrations were compared in reciprocal grafts of two tomato cultivars and a commercial interspecific hybrid tomato rootstock (MX). At harvesting, many shoot growth parameters were affected by both scion and rootstock cultivar, with MX promoting plant vigor either as a scion or rootstock. The root mass of reciprocal grafts was affected only by the scion, highlighting the need for future research examining scion effects on root traits and the underlying physiological mechanisms. In contrast, vigor is unwelcome in grafted watermelon, as too vigorous vegetative growth is considered as a potential reason why fruit set and harvest are delayed in grafted watermelon compared to un-grafted plants. To better understand the relationship between vegetative growth, nutrient status and flower production, reciprocal grafts of two commercial rootstocks: interspecific hybrid squash and wild watermelon and a commercial seedless watermelon were grown in a greenhouse in a spring and fall trial. Dissections at the time of grafting, post graft-healing, and at-transplanting revealed developing flowers at similar nodes for all treatments. However, the nodal position of first open male flower was higher for grafted treatments compared to un-grafted plants. Furthermore, female flower production started later, and was reduced for grafted treatments compared to un-grafted treatments in the fall trial. This flowering information indicates that the development of previously initiated flowers was arrested following transplanting in grafted plants and delayed flowering, depending on the rootstock and environmental conditions, may explain reported harvest delays. We also found that lower levels of B and Zn in shoot, critical micronutrients for flower development and fruit set, when grafted on to squash rootstock. Following these findings, two-year greenhouse and field experiments were conducted to test the effects of different rootstocks and altered nutrient management treatments on early flower production, fruit set, and, in the field trial, yield of grafted watermelon. In all trials conducted in greenhouse and field, altered nutrient management did not improve the time to flower, early flower production, number of fruits, or yield, compared to standard management and, in some cases, further delayed reproductive development, though there were differences between trials. When grafted onto squash rootstock, the first successful fruit set was delayed compared to other treatments. These experiments provide a thorough examination of reproductive development trends in grafted watermelon and identify the first week of fruit set as the most critical time period for further research and targeted management. These experiments also highlight the need for more information regarding the degree to which environmental conditions interact with the scion and rootstock combination to affect reproductive and vegetative growth.

English

ISBN: 9798314890554Subjects--Topical Terms:

555447
Horticulture.
Subjects--Index Terms:

Vegetable grafting

Whole-Plant Physiology of Grafted Tomato and Watermelon Plants for Optimized Nutrient Management /
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653 $a Solanum lycopersicum
653 $a Citrullus lanatus
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653 $a Rootstock
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