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Title: Source:sink imbalance detected with leaf and canopy-level spectroscopy in a field-grown crop

Journal Article · · Plant, Cell and Environment
DOI:https://doi.org/10.1111/pce.14056· OSTI ID:1773145

Abstract The finely tuned balance between sources and sinks determines plant resource partitioning and regulates growth and development. Understanding and measuring metabolic indicators of source or sink limitation forms a vital part of global efforts to increase crop yield for future food security. We measured metabolic profiles of Cucurbita pepo (zucchini) grown in the field under carbon sink limitation and control conditions. We demonstrate that these profiles can be measured non‐destructively using hyperspectral reflectance at both leaf and canopy scales. Total non‐structural carbohydrates (TNC) increased 82% in sink‐limited plants; leaf mass per unit area (LMA) increased 38% and free amino acids increased 22%. Partial least‐squares regression (PLSR) models link these measured functional traits with reflectance data, enabling high‐throughput estimation of traits comprising the sink limitation response. Leaf‐ and canopy‐scale models for TNC had R 2 values of 0.93 and 0.64 and %RMSE of 13 and 38%, respectively. For LMA, R 2 values were 0.91 and 0.60 and %RMSE 7 and 14%; for free amino acids, R 2 was 0.53 and 0.21 with %RMSE 20 and 26%. Remote sensing can enable accurate, rapid detection of sink limitation in the field at the leaf and canopy scale, greatly expanding our ability to understand and measure metabolic responses to stress.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
SC0012704; DE‐SC0012704
OSTI ID:
1773145
Alternate ID(s):
OSTI ID: 1779357
Report Number(s):
BNL-221213-2021-JAAM
Journal Information:
Plant, Cell and Environment, Vol. 44, Issue 8; ISSN 0140-7791
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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