Photosynthetica

, Volume 54, Issue 2, pp 161–184 | Cite as

Prospects of photosynthetic research for increasing agricultural productivity, with emphasis on the tropical C4Amaranthus and the cassava C3-C4 crops

Review

Abstract

Productivity of most improved major food crops showed stagnation in the past decades. As human population is projected to reach 9–10 billion by the end of the 21st century, agricultural productivity must be increased to ensure their demands. Photosynthetic capacity is the basic process underlying primary biological productivity in green plants and enhancing it might lead to increasing potential of the crop yields. Several approaches may improve the photosynthetic capacity, including integrated systems management, in order to close wide gaps between actual farmer’s and the optimum obtainable yield. Conventional and molecular genetic improvement to increase leaf net photosynthesis (PN) are viable approaches, which have been recently shown in few crops. Bioengineering the more efficient CC4 into C3 system is another ambitious approach that is currently being applied to the C3 rice crop. Two under-researched, yet old important crops native to the tropic Americas (i.e., the CC4 amaranths and the C3-CC4 intermediate cassava), have shown high potential PN, high productivity, high water use efficiency, and tolerance to heat and drought stresses. These physiological traits make them suitable for future agricultural systems, particularly in a globally warming climate. Work on crop canopy photosynthesis included that on flowering genes, which control formation and decline of the canopy photosynthetic activity, have contributed to the climate change research effort. The plant breeders need to select for higher PN to enhance the yield and crop tolerance to environmental stresses. The plant science instructors, and researchers, for various reasons, need to focus more on tropical species and to use the research, highlighted here, as an example of how to increase their yields.

Additional key words

agricultural sustainability breeding C3, C4, C3-C4 species canopy climate change crop modeling environmental stress enzyme food security genetic engineering grain leaf Kranz anatomy photorespiration photosynthetic pathway protein starch storage-root water yield 

Abbreviations

APAR

absorbed photosynthetically active radiation

Ca

ambient CO2 concentration

Ci

intercellular CO2 concentration

CA

carbonic anhydrase

gs

stomatal conductance

GDC

glycine decarboxylase

IRGA

infra-red gas analyser

LAI

leaf area/land surface area index

Km

Michaelis constant

NAD-ME

NAD-malic enzyme

NADP-ME

NADP-malic enzyme

PN

net photosynthetic rate

PEP

phosphoenolpyruvate

PEPC

phosphoenolpyruvate carboxylase

PEPCK

PEP-carboxykinase

PER

protein efficiency ratio

PNUE

photosynthetic nitrogen-use efficiency

PPDK

pyruvate, phosphate dikinase

RUE

radiation-use efficiency

TCA

tricarboxylic acid

Vmax

maximum carboxylation rate

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© The Institute of Experimental Botany 2016

Authors and Affiliations

  1. 1.Centro Internacional de Agricultura Tropical (CIAT)CaliColombia
  2. 2.A. A. 26360Cali,ValleColombia

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