NDLI: Relations between carbohydrate accumulation in leaves, sucrose phosphate synthase activity and photoassimilate transport in chilling treated maize seedlings

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Relations between carbohydrate accumulation in leaves, sucrose phosphate synthase activity and photoassimilate transport in chilling treated maize seedlings

Content Provider	Springer Nature Link
Author	Sowiński, Paweł Dalbiak, Agnieszka Tadeusiak, Jolanta Ochodzki, Piotr
Copyright Year	1999
Abstract	Sucrose and starch concentration, sucrose phosphate synthase (SPS) activity in leaves, and long distance transport were studied in maize seedlings treated with moderate chilling (14 °C/12 °C - day/night).Two inbred lines were tested: chilling-tolerant KW1074 and chilling-sensitive CM109. Seedlings were grown in phytotrone on water nutrient until the 4-th leaf appearance. The estimations were done on fully developed 2-nd leaf.Six days after the temperature was lowered, leaves of line KW 1074 plants contained 5-fold more sucrose and starch than the control ones. The same treatment of CM 109 seedlings resulted in accumulation of sucrose and starch by 2-fold and 8.5-fold, respectively.As the result of chilling-treatment, $^{14}$C assimilation rate (P$_{a}$), transport speed in the leaf blade (TS$_{1}$) and along the plant (TS$_{m}$) decreased by about 50 % in both lines. On the other hand, time necessary for radiolabel movement into the phloem loading region (AT) increased strongly, especially in chilling-sensitive line CM 109. It was also noted, that the radioactivity exported from leaves (R$_{1}$) and imported by roots (R$_{m}$) decreased in line CM 109, and increased slightly in line KW 1074.The activity of SPS extracted from leaves of both lines decreased by about 3.3 when temperature was lowered form 30°C to 10°C. There was no effect of 6 day treatment of chilling on SPS activity.Changes in sucrose and starch concentration, SPS activity as well as differences in transport parameters observed in KW1074 and CM109 seedlings at moderate low temperatures are discussed in terms of mechanism of maize chilling-sensitivity.
Starting Page	375
Ending Page	381
Page Count	7
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	21
Issue Number	4
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	assimilate transport sucrose starch SPS low temperature Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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