Post-Anthesis Mobilization of Stem Assimilates in Wheat under Induced Stress

Mian Faisal Nazir,Talat Mahmood,Muhammad Ishaq Asif Rehmani,Muhammad Shahid Iqbal,Naimatullah Mangi,Sobhy Gharib Rizk Sorour,Zareen Sarfraz,Mohamed El-Sharnouby,Tahir Mahmood,Muhammad Kausar Nawaz Shah,Ayman El Sabagh,Mohamed Khamees Aly Shabaan

doi:10.3390/su13115940

Abstract

Stem reserves in grain crops are considered important in grain filling under post-anthesis stress in the absence/low availability of photosynthetic assimilates. Considerable variation is present among genotypes for stem reserve translocation in wheat. Therefore, this study aimed to exploit the phenotypic variation for stem reserve translocation in wheat under control and chemically induced stress conditions. The phenotypic variation among six parents and their corresponding direct cross combinations was evaluated under induced stress conditions. The results signify the presence of considerable variation between treatments, genotypes, and treatment-genotype interactions. The parent LLR-20 depicted the highest translocation of dry matter and contribution of post-anthesis assimilates under induced-stress conditions. Similarly, cross combinations Nacozari × LLR22, Nacozari × LLR 20, Nacozari × Parula, Nacozari × LLR 21, LLR 22 × LLR 21, and LLR 20 × LLR 21 showed higher source-sink accumulation under induced-stress conditions. The selected parents and cross combinations can be further utilized in the breeding program to strengthen the genetic basis for stress tolerance in wheat.

Highlights

Pakistan is among the countries with the rising adversary of climate change [1] in terms of increasing temperatures and random rainfalls [2]
We evaluated wheat genotypes under control and induced stress conditions for phenotypic traits related to stem reserve mobilization
This study aimed to provide an efficient method for screening the germplasm for stress tolerance under chemically induced stress conditions, which can be utilized as a generalized response towards stress

Summary

Introduction

Pakistan is among the countries with the rising adversary of climate change [1] in terms of increasing temperatures and random rainfalls [2]. Achieving maximum yield under the climate change scenario is critical for sustainable agriculture [3]. Increased evapotranspiration with the increase in annual temperature has emerged as a natural hindrance in arid zones [4], resulting in reduced crop production. Wheat production, both in irrigated and rainfed areas, is hampered due to environmental stresses [5]. Stabilizing grain yield under stress conditions is likely influenced by storage of photosynthetic assimilates and their efficiency remobilization [9,10]. Stem reserves are critically involved in yield enhancement by improving

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