Evaluating Chlorophyll Fluorescence Potential for the Characterization of Leaf Photosynthesis under Post-Heading Low Temperature Stress | [Abstract Book on Second International Conference on Recent Approaches in Plant Sciences (RAPS-23) 4-5 May 2023 • 2023]

Author(s):

1. Iftikhar Ali: Department of Agronomy, University of Agriculture,Faisalabad, Pakistan; National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

2. Min Kang: National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

3. Aqib Mahmoo: National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

4. Junjie Dai: National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

5. Bing Liu: National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

6. Leilei Liu: National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

7. Weixing Cao: National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

8. Tang Liang: National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

9. Yan Zhu: National Engineering and Technology Center for Information Agriculture, Nanjing Agricultural University, China

Abstract:

Low-temperature stress (LTS) is a serious threat to rice productivity. Characterizing photosynthesis under LTS deepens our understanding of cropenvironment interactions. We explored the potential of leaf scale chlorophyll fluorescence (CF) for assessing photosynthetic responses to LTS. Two Japonica rice cultivars (Huaidao 5 and Nanjing 46) were tested under four lowtemperature levels [Tmin/Tmax: 21/27 (control), 17/23, 13/19, and 09/15 ?] for three durations [3, 6, and 9 days] at flowering and grain filling stages. As compared to the control, CF- and gas exchange-based photosynthetic parameters were generally significantly lower under LTS in Huaidao 5 and Nanjing 46. The severity of negative effects of LTS of 12 ? increased with increasing lowtemperature duration. LTS of 12 ? for 9 days inhibited energy dissipation through regulatory pathways (?Fnpq) and increased energy dissipation through non-regulatory pathways (?FNO). Overall, Nanjing 46 was photosynthetically more sensitive to LTS than Huaidao 5, but differences among stages were less prominent. As compared to the control, canopy temperatures of 12.6, 14.7, and 15.1 ? in Huaidao 5, and 14.7, 15.9, and 16.5 ? in Nanjing 46, caused a 50% declined in Asat under LTS for 3, 6, and 9 days at the grain filling stage, respectively. Moreover, all the photosynthetic parameters decreased exponentially with increasing accumulated cold degree days (ACDD) based on canopy temperature However, our results showed that only CT is more accurate in estimating LTS effects on photosynthesis at each duration separately instead of using ACDD. Our findings also revealed that the CF-based rapid light curves (RLCs) can estimate conventional light response curves (LRCs) in rice under optimal and suboptimal temperatures.

Page(s): 37-37

DOI: DOI not available

Published: Journal: Abstract Book on Second International Conference on Recent Approaches in Plant Sciences (RAPS-23) 4-5 May 2023 , Volume: 0, Issue: 0, Year: 2023

Keywords:

Gas exchange , Chlorophyll fluorescence , light response curve , canopy temperature , rapid light curve

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