Historical gains in soybean (Glycine max Merr.) seed yield are driven by linear increases in light interception, energy conversion, and partitioning efficiencies

Robert P. Koester, Jeffrey A. Skoneczka, Troy R. Cary, Brian W Diers, Elizabeth Ainsworth

Research output: Contribution to journalArticle

Abstract

Soybean (Glycine max Merr.) is the world's most widely grown leguminous crop and an important source of protein and oil for food and feed. Soybean yields have increased substantially throughout the past century, with yield gains widely attributed to genetic advances and improved cultivars as well as advances in farming technology and practice. Yet, the physiological mechanisms underlying the historical improvements in soybean yield have not been studied rigorously. In this 2-year experiment, 24 soybean cultivars released between 1923 and 2007 were grown in field trials. Physiological improvements in the efficiencies by which soybean canopies intercepted light (ε i ), converted light energy into biomass (ε c ), and partitioned biomass into seed (ε p ) were examined. Seed yield increased by 26.5 kg ha -1 year -1 , and the increase in seed yield was driven by improvements in all three efficiencies. Although the time to canopy closure did not change in historical soybean cultivars, extended growing seasons and decreased lodging in more modern lines drove improvements in ε i . Greater biomass production per unit of absorbed light resulted in improvements in ε c . Over 84 years of breeding, soybean seed biomass increased at a rate greater than total aboveground biomass, resulting in an increase in ε p . A better understanding of the physiological basis for yield gains will help to identify targets for soybean improvement in the future.

Original languageEnglish (US)
Pages (from-to)3311-3321
Number of pages11
JournalJournal of experimental botany
Volume65
Issue number12
DOIs
StatePublished - Jul 2014

Fingerprint

energy conversion
Soybeans
seed yield
Glycine max
Seeds
soybeans
Light
Biomass
cultivars
canopy
lodging
biomass
bioenergy
seeds
aboveground biomass
protein sources
genetic improvement
Agriculture
biomass production
field experimentation

Keywords

  • Energy conversion efficiency
  • Harvest index
  • Light interception efficiency
  • Partitioning efficiency
  • Radiation use efficiency
  • Yield potential

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Cite this

Historical gains in soybean (Glycine max Merr.) seed yield are driven by linear increases in light interception, energy conversion, and partitioning efficiencies. / Koester, Robert P.; Skoneczka, Jeffrey A.; Cary, Troy R.; Diers, Brian W; Ainsworth, Elizabeth.

In: Journal of experimental botany, Vol. 65, No. 12, 07.2014, p. 3311-3321.

Research output: Contribution to journalArticle

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