eprintid: 12044
rev_number: 7
eprint_status: archive
userid: 3178
dir: disk0/00/01/20/44
datestamp: 2023-03-15 07:31:42
lastmod: 2023-03-15 07:31:42
status_changed: 2023-03-15 07:31:42
type: conference_item
metadata_visibility: show
creators_name: Ankush, W
creators_name: Ashutosh, P
creators_name: Janila, P
icrisatcreators_name: Ankush, W
icrisatcreators_name: Janila, P
country: India
title: Step-wise selection for early canopy traits followed by stress tolerance indices as an approach for improving
drought tolerance in groundnut (Arachis hypogaea L.)
ispublished: pub
subjects: s1.3
divisions: GRP_ACI
full_text_status: public
pres_type: poster
abstract: Rationale:
Drought stress at the pod filling stage of groundnut is a major yield constraint in the semi-arid tropics of Africa and
Asia.
Methods:
A population of 600 MAGIC lines (MLs) (F8/9generation) is studied in Leasyscan, a high throughput phenotyping
platform (HTPP) that assessed canopy growth up to 45 days after planting (DAP), and under managed stress
environment that uses drip lines for application of uniform and measured quantity of water in well-watered (WW)
and water-stress (WS) plots. Intermittent drought was imposed from 60 DAP coinciding with pod-filling stage, and
time domain reflectometry (TDR) probes measured soil moisture.
Results:
During 2018-19, the Mean Score Index (MSI) of Productivity and Resilience indices selected 20 MLs (MSI=9-10)
at par with the checks, ICGV 02266 (MSI=9.4) and ICGV 03043 (MSI=9.2). About 50% of the MLs (320) recorded a
Leaf Area Index (LAI) of <0.30 from which 12 MLs recorded high MSI. From 122 MLs that recorded superior digital
biomass (11173 to 11297 m3) at 45 DAP than the drought tolerant check ICGV 02266 (10245 m3), eight MLs recorded
high MSI. Extreme water stress of 100 mm imposed at pod filling stage in 2021-22 resulted in a yield reduction of
>70% in 402 MLs, however, 29 MLs with <20% yield reduction were selected.
Conclusions & Perspectives:
Early generation selection using HTPP (LeasyScan) for early canopy traits followed by stress index-based selections
in managed stress environment is proposed for drought tolerance breeding in groundnut. The MAGIC population is
a valuable source for improving drought tolerance.
date: 2022-12-02
date_type: published
event_title: The 7th Congress on Plant Production In Water - Limited Environment
event_location: King Fahd Hotel, Dakar, Senegal
event_dates: 28 Nov - 02 Dec 2022
event_type: conference
refereed: TRUE
citation:   Ankush, W and Ashutosh, P and Janila, P  (2022) Step-wise selection for early canopy traits followed by stress tolerance indices as an approach for improving drought tolerance in groundnut (Arachis hypogaea L.).  In: The 7th Congress on Plant Production In Water - Limited Environment, 28 Nov - 02 Dec 2022, King Fahd Hotel, Dakar, Senegal.     
document_url: http://oar.icrisat.org/12044/1/7151_with%20cover.pdf