Large Vascular Bundle Phloem Area 4 enhances grain yield and quality in rice via source–sink–flow

• DOI: 10.1093/plphys/kiac461
• Publication Date: 2022-09-30T19:48:18Z
• Authors: Laiyuan Zhai; An Yan; Kuitian Shao; Shu Wang; Yun Wang; Zhong-Hua Chen; Jianlong Xu
• Keywords: Sink (geography)

In rice (Oryza sativa L.), vascular bundle phloem tissue in the panicle neck is vital for transport of photosynthetic products from leaf to and positively associated with grain yield. However, genetic regulation single large area (LVPA) remains poorly understood. this study, we carried out genome-wide association analysis LVPA using 386 accessions isolated characterized gene LVPA4, which allelic NARROW LEAF1 (NAL1). Phenotypic analyses were on near-isogenic line (NIL) NIL-LVPA4LT high-yielding indica (xian) cultivar Teqing overexpression lines transformed a vector carrying Lemont alleles LVPA4. Both LVPA4 exhibited significantly increased LVPA, enlarged flag size, improved type. had 7.6%-9.6% yield increase, mainly due higher filled number per panicle, larger system transporting photoassimilates spikelets, more sufficient source supply that could service sink capacity. Moreover, quality compared Teqing, was attributed substantial improvement filling, especially inferior spikelets NIL-LVPA4LT. The single-nucleotide variation third exon spikelet number, size throughout sequencing panels. results demonstrate has synergistic effects capacity, flow plays crucial roles productivity quality, thus revealing value breeding programs varieties.