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The Invisible Light Stimulus: Physiological Mechanisms of Yield Improvement by Far-Red Radiation in Tomato.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The Invisible Light Stimulus: Physiological Mechanisms of Yield Improvement by Far-Red Radiation in Tomato./
Author:	Ji, Yongran.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	160 p.
Notes:	Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
Contained By:	Dissertations Abstracts International83-02B.
Subject:	Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28591310
ISBN:	9798522948450

The Invisible Light Stimulus: Physiological Mechanisms of Yield Improvement by Far-Red Radiation in Tomato.
Ji, Yongran.

The Invisible Light Stimulus: Physiological Mechanisms of Yield Improvement by Far-Red Radiation in Tomato. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 160 p.

Source: Dissertations Abstracts International, Volume: 83-02, Section: B.

Thesis (Ph.D.)--Wageningen University and Research, 2021.

This item must not be sold to any third party vendors.

Tomato (Solanum lycopersicum) is not only one of the world’s most important horticultural crops but also one of the main crops for greenhouse production. Modern greenhouse production is not only expected to increase yield and product quality but also to achieve that sustainably. The horticultural sector has long been at the front of technological advances in crop production. Light is one of the most important environmental factors in crop production, and it is a common practice to apply supplementary lighting in greenhouses at locations where low daily light integral is low during the growing season to ensure a year-round production. In these greenhouses, the high-pressure sodium (HPS) lamps are the most used light source due to their low price and decent eﬀicacy in converting electric power to light photons. Despite their popularity, HPS lamps also have disadvantages such as excessive heat emission and inflexibility in the light spectrum. Recently, light-emitting-diodes (LEDs) emerge as an exciting alternative to HPS lamps. LED lighting has over 60% higher eﬀicacy, low heat emission, and can be customized to provide different intensities and spectra. The popularity of LED lighting in horticultural production also stimulated research on the spectral effects of supplementary lighting on plant growth and development, even extending the research to the spectrum that is beyond photosynthetically active radiation (400-700 nm). Far-red radiation (FR), which has a wavelength between 700-800 nm, has been extensively studied due to its role in plant’s neighbor detection and sensing of shading. Interestingly, several studies point towards yield increases as a result of additional FR in several crops. This thesis aims to understand the effect of adding FR on the responses of growth and development of both young and fruit-bearing tomato plants. Specifically, 1) to evaluate and explain genotypic variation in dry mass production of young tomato plants in response to FR, 2) to quantify the FR effect on dry mass partitioning between shoot and root in young tomato plants and explain the regulatory mechanisms, 3) to evaluate whether FR leads a trade-off between growth and plant immunity, and 4) to quantify the FR effect on tomato fruit yield and study the physiological and molecular pathways by which FR regulates this response. Chapter 1 described the status of greenhouse tomato production, and what is known about plants’ responses to FR. The development of supplementary lighting used in greenhouse tomato production was described, and a comparison was made between the more eﬀicient LED lighting and conventional HPS lighting. Here, known effects on the perception of FR and its regulation of shade avoidance responses were summarized. The latest studies were summarized, and they pointed towards a positive effect of FR on tomato yield. However, these studies did not reveal a clear mechanism for this yield improvement. Moreover, there was contradiction and variation between the results, suggesting that species and even different genotypes within the same species may respond differently to FR. FR may also alter the partitioning of photosynthetic assimilates between organs. Findings in the regulation of dry mass partitioning in plants were summarized and they demonstrated a knowledge gap between a well-studied regulatory network downstream the perception of FR and a set of FR-induced growth responses.

ISBN: 9798522948450Subjects--Topical Terms:

673386
Physiology.

The Invisible Light Stimulus: Physiological Mechanisms of Yield Improvement by Far-Red Radiation in Tomato.
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