Exploring the Relationships Between Yield and Yield-Related Traits for Rice Varieties Released in China From 1978 to 2017

Abstract

Despite evidence from previous case studies showing that agronomic traits partially determine the resulting yield of different rice ( Oryza sativa L.) varieties, it remains unclear whether this is true at the ecotype level. Here, an extensive dataset of the traits of 7686 rice varieties, released in China from 1978 to 2017, was used to study the relationship between yield and other agronomic traits. We assessed the association between yield and other agronomic traits for four different rice ecotypes, i.e., indica inbred, indica hybrid, japonica inbred, and japonica hybrid. We found that associations between agronomic traits and yield were ecotype-dependent. For both the indica inbred and indica hybrid ecotypes, we found that greater values of certain traits, including the filled grain number per panicle, 1000-grain-weight, plant height, panicle length, grains per panicle, seed setting rate, long growth period, low panicle number per unit area, and low seed length/width ratio, have accounted for high grain yield. In the japonica inbred and japonica hybrid ecotypes, we found that only high panicle number per unit area and long growth period led to high grain yield. Indirectly, growth period consistently had a positive effect on yield in all ecotypes, and plant height had a positive effect on yield for the indicas and japonica inbred only. Plant height had a negative effect for the japonica hybrid. Altogether, our findings potentially have valuable implications for improving the breeds of rice ecotypes.

Optimization of leaf properties and plant phenotype through yield‐based genetic improvement of rice over a period of seventy years in the Yangtze River Basin of China

“…To analyze the temporal changes ideotyped, several researchers have highlighted correlation between grain yield and morphophysiological parameters like growth duration, leaf area index, leaf area duration, crop growth rate, relative growth rate, absolute growth rate, and harvest index in rice (Janardhan & Murty, 1978;Karki et al, 2018;Kumar, Nayak, & Kumar, 2016;Li, Li, Ashraf, Liu, & Zhang, 2019;Peng et al, 2000;Vergara, Tanaka, Lilis, & Puranabhavung, 1966). These growth indices are largely determined by source activity, which very often influence grain yield; large leaf area index and duration and high photosynthetic rate and slow leaf senescence promote grain number and filling and vice versa (Katsura et al, 2007;Tian, Jing, & Dai, 2011;Zheng et al, 2011).…”

Character Association Studies in Lowland Rice Cultivars of Bihar

“…In agriculture, path analysis has been used by plant breeders to assist in identifying traits that are useful as selection criteria to improve crop yield. Similar type of studies was done by [5] and [6].…”

Swampy rice lines for iron toxicity tolerance and yield components performance under inland swamp at Sorong, West Papua, Indonesia

“…The line of G1 showed the longest panicle length (PL) comparing all the lines tested. The panicle length and grain yield showed a positive association to the Indica inbred ecotypes (Li et al 2019). The second rank on the yield characters was G7 line that has a yield of 5.92 t.ha -1 .…”