Growth and photosynthetic down-regulation in Coffea arabica in response to restricted root volume

Functional Plant Biology : FPB
Cláudio P RonchiCarlos Ducatti

Abstract

Coffee (Coffea arabica L.) plants were grown in small (3-L), medium (10-L) and large (24-L) pots for 115 or 165 d after transplanting (DAT), which allowed different degrees of root restriction. Effects of altered source : sink ratio were evaluated in order to explore possible stomatal and non-stomatal mechanisms of photosynthetic down-regulation. Increasing root restriction brought about large and general reductions in plant growth associated with a rising root : shoot ratio. Treatments did not affect leaf water potential or leaf nutrient status, with the exception of N content, which dropped significantly with increasing root restriction even though an adequate N supply was available. Photosynthesis was severely reduced when plants were grown in small pots; this was largely associated with non-stomatal factors, such as decreased Rubisco activity. At 165 DAT contents of hexose, sucrose, and amino acids decreased in plants grown in smaller pots, while those of starch and hexose-P increased in plants grown in smaller pots. Photosynthetic rates were negatively correlated with the ratio of hexose to free amino acids, but not with hexose content. Activities of acid invertase, sucrose synthase, sucrose-P synthase, fructose-1,6-bispho...Continue Reading

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Citations

Oct 1, 2017·Functional Plant Biology : FPB·Saulo de T AidarCarolina V Morgante
Dec 1, 2016·Functional Plant Biology : FPB·João Paulo SouzaCarlos Henrique B A Prado
Feb 1, 2016·Functional Plant Biology : FPB·Anaëlle DambrevilleChristine Granier
Nov 1, 2012·Functional Plant Biology : FPB·Hendrik PoorterJohannes A Postma
Jun 1, 2007·Functional Plant Biology : FPB·Rui A Gomes-JuniorRicardo A Azevedo
Dec 14, 2018·Plant, Cell & Environment·Maria Antonia M BarbosaAgustin Zsögön
May 5, 2016·Plant, Cell & Environment·M HohmannR J Snowdon
Dec 11, 2013·PloS One·José C RamalhoFábio M DaMatta
May 25, 2021·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Jessica Dias Gomes da SilvaGismael Francisco Perin
Mar 9, 2018·Journal of Agricultural and Food Chemistry·Fábio M DaMattaJosé C Ramalho

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