Critical Period of Moisture Vulnerability in Mungbeans

GRDC - Author: Kylie Wenham (QAAFI, The University of Queensland), Alwyn Williams (SAFS, The University of Queensland), RCN Rachaputi (QAAFI, The University of Queensland), Tim Rossignol (QAAFI, The University of Queensland) and Marisa Collins (La Trobe University)

Type: Research Paper
Knowledge level: Advanced

Farm Table says:

The authors of this paper note in the conclusion: “While the total number of harvestable pods is reduced when plants are under drought stress, drought stress during pod fill can increase individual or 100 grain weight through efficient remobilization of assimilate reserves to partially compensate for lower pod number. However, the total grain yield shortfall is still substantial.”. Please access the full paper via the link below if this research interests you.

The take home messages from this GRDC funded research are below. Please access the full paper via the link below for methodology, references, acknowledgements and discussion.

  • Mungbeans are most vulnerable to drought stress during the pod filling phase. It is critical to ensure adequate moisture is available or has been applied by irrigation during this period
  • Drought stress during pod filling reduces the number of grains per pod and the overall number of pods per plant
  • Yield decreased in response to drought stress by 10-33% during vegetative growth, 5-27% during flowering and 53-75% from early-pod fill compared with well-watered.  Yield response to drought differed between varieties
  • Mungbeans compensate for lower pod number by increasing carbon allocation to remaining pods – increasing individual grain weight and partially offsetting yield losses for stress occurring during flowering
  • Optimising sowing time or irrigation timing to avoid drought stress during pod-fill will improve grain yield stability.

Figure 3. Maximum (red line) and minimum (blue line) temperatures (°C) from planting to the end of the pod-filling drought stress treatment.

2020 - Australia - GRDC - Author: Kylie Wenham (QAAFI, The University of Queensland), Alwyn Williams (SAFS, The University of Queensland), RCN Rachaputi (QAAFI, The University of Queensland), Tim Rossignol (QAAFI, The University of Queensland) and Marisa Collins (La Trobe University)
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