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Open AccessArticle

Expression of Genes Related to Sugar and Amino Acid Transport and Cytokinin Metabolism during Leaf Development and Senescence in Pisum sativum L.

1
School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand
2
The New Zealand Institute for Plant & Food Research Limited, Private Bag 4704, Christchurch 8140, New Zealand
3
School of Life Sciences, Yantai University, Yantai 264005, China
*
Author to whom correspondence should be addressed.
Plants 2019, 8(3), 76; https://doi.org/10.3390/plants8030076
Received: 27 February 2019 / Revised: 12 March 2019 / Accepted: 19 March 2019 / Published: 25 March 2019
(This article belongs to the Special Issue Leaf Senescence)
Gene editing is becoming the plant breeding tool of choice, but prior to targeting a gene for editing, a knowledge of the gene family members (GFMs) controlling yield is required in the specific crop plant. Critical to yield are components from senescing leaves. We targeted genes controlling senescence in Pisum sativum and the release and transport of carbohydrates and amino acids from the source leaves to the pods and seeds. The expression of GFMs for cytokinin biosynthesis (IPT) and destruction (CKX), sucrose transporters (SUT), Sugar Will Eventually be Exported Transporters (SWEET), amino acid permeases (AAP), and cell wall invertases, was determined using RT-qPCR. GFMs were differentially expressed in leaves of different ages. The expression of many gene family members was lower in the expanding sink leaves compared with the senescing leaves, with the exception of two PsAAP GFMs and PsCKX5, which were highly expressed. Expression of specific PsSWEETs, SUTs, and AAPs increased in the mature and/or senescing leaves. Expression of PsIPTs was least in the mature source leaves, but as strong in the senescing leaves as in the young source leaves. PsCKX7 was expressed in source and senescing leaves. We discuss the potential impact of the targeted reduction of specific PsCKX GFMs on source-sink relationships. View Full-Text
Keywords: amino acid transporter (AAP); cytokinin; cytokinin oxidase; isopentenyl transferase; pea; senescence; source–sink; sucrose transporter (SUT); SWEET amino acid transporter (AAP); cytokinin; cytokinin oxidase; isopentenyl transferase; pea; senescence; source–sink; sucrose transporter (SUT); SWEET
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Ninan, A.S.; Grant, J.; Song, J.; Jameson, P.E. Expression of Genes Related to Sugar and Amino Acid Transport and Cytokinin Metabolism during Leaf Development and Senescence in Pisum sativum L.. Plants 2019, 8, 76.

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