IC4R007-Phenomics-2015-26104586 - Revision history

Guangyi: /* The Background of This Project */

2016-07-22T09:25:56Z

‎The Background of This Project

Guangyi: /* Research Findings */

2016-07-22T09:23:18Z

‎Research Findings

Guangyi: /* Research Findings */

2016-07-22T09:21:08Z

‎Research Findings

Guangyi: /* Research Findings */

2016-07-22T09:19:56Z

‎Research Findings

Guangyi: /* Research Findings */

2016-07-22T09:14:22Z

‎Research Findings

Guangyi: /* Research Findings */

2016-07-22T09:06:07Z

‎Research Findings

Guangyi: /* Research Findings */

2016-07-22T09:03:34Z

‎Research Findings

Guangyi: /* Research Findings */

2016-07-22T09:01:24Z

‎Research Findings

Guangyi: /* Research Findings */

2016-07-22T09:00:23Z

‎Research Findings

Guangyi: /* Research Findings */

2016-07-22T08:48:49Z

‎Research Findings

← Older revision		Revision as of 09:25, 22 July 2016
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	==The Background of This Project==		==The Background of This Project==
		+	*Rice spikelet sterility caused by chilling during microspore stage of panicle development is a major cause of the rareness of the indica sub-species in cool environments. A diversity panel of 200 indica accessions including traditional and improved accessions forming 4 genetic sub-groups (I1 to I4), along with 22 accessions representing other genetic groups of Oryza sativa L., was field phenotyped for spikelet sterility under flooded management. Environments were six seasonal climatic situations (sowing dates) in Senegal, ranging from cool to hot; and at two altitudes (857 and 1497 m asl) and two years in Madagascar.
		+	<br>

	==Plant Culture & Treatment==		==Plant Culture & Treatment==

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 *Sterility levels observed at given sowing dates or locations among check varieties are difficult to compare because different phenology causes de-synchronization of the cold sensitive booting stage (coinciding with microspore stage). The researchers thus regressed the observed sterility against the estimated mean minimal water temperature during the presumed sensitive phase for each observation (Fig. 3), excluding data potentially affected by heat induced sterility.
 <br>
-[[File:IC4R007-Phenomics-2015-26104586-f3.png |center |thumb |10000px |''''''Fig. 3. Response of fraction spikelet sterility of three check varieties to estimated minimum water temperature (Tw) at booting to heading stage; in Madagascar (two altitudes confounded, filled symbols) and Senegal (6 sowing dates confounded, open symbols). Cases of temperatures >23 ◦C were removed to exclude incidence of heat induced sterility. Lines indicate linear regression and 95%-confidence interval.'''''']]
+[[File:IC4R007-Phenomics-2015-26104586-f3.png |right |thumb |10000px |''''''Fig. 3. Response of fraction spikelet sterility of three check varieties to estimated minimum water temperature (Tw) at booting to heading stage; in Madagascar (two altitudes confounded, filled symbols) and Senegal (6 sowing dates confounded, open symbols). Cases of temperatures >23 ◦C were removed to exclude incidence of heat induced sterility. Lines indicate linear regression and 95%-confidence interval.'''''']]
 <br>
 *To illustrate the diversity of observed responses, 25 selected accessions from different genetic groups and having contrasting thermal response of spikelet sterility are presented in Fig. 4. The same type of linear regression analysis was performed as for the checks in Fig. 3, but data from Senegal and Madagascar were combined in a single regression analysis (but represented with different symbols in Fig. 4)

@@ Line 10: / Line 10: @@
 ==Research Findings==
-[[File:IC4R007-Phenomics-2015-26104586-f1a.png |left |thumb |10000px ]]
+[[File:IC4R007-Phenomics-2015-26104586-f1a.png |right |thumb |10000px ]]
-[[File:IC4R007-Phenomics-2015-26104586-f1b.png |left |thumb |10000px |''''''Fig. 1. Seasonal dynamics of spikelet sterility and duration from sowing to flowering for four check varieties in Senegal. Means of six replications and SEM are presented.'''''']]
+[[File:IC4R007-Phenomics-2015-26104586-f1b.png |right |thumb |10000px |''''''Fig. 1. Seasonal dynamics of spikelet sterility and duration from sowing to flowering for four check varieties in Senegal. Means of six replications and SEM are presented.'''''']]
 <br>
 *Sowing dates were in February (07/02/2009, Date (1)March (07/03/2009, Date (2), April (07/04/2009, Date (3), July(17/07/2009, Date (4), September (17/09/2009, Date (5) and October (19/10/2009, Date (6). Dates 1–3 fell into the hot-dry season, Date 4 corresponded to the recommended main (wet) season,Date 5 was a late wet season sowing date frequently associated with cool nights during reproductive development, and Date6 was a date generally associated with chilling stress causing spikelet sterility, associated with very low air humidity (Fig. 1)

@@ Line 10: / Line 10: @@
 ==Research Findings==
 *Sowing dates were in February (07/02/2009, Date (1)March (07/03/2009, Date (2), April (07/04/2009, Date (3), July(17/07/2009, Date (4), September (17/09/2009, Date (5) and October (19/10/2009, Date (6). Dates 1–3 fell into the hot-dry season, Date 4 corresponded to the recommended main (wet) season,Date 5 was a late wet season sowing date frequently associated with cool nights during reproductive development, and Date6 was a date generally associated with chilling stress causing spikelet sterility, associated with very low air humidity (Fig. 1)
 <br>
 *The cold tolerant check Chomrong was not tested in Madagascar.For the remaining three checks, duration to flowering was almost constantly 23 days longer at high altitude (1497 m asl) than at mid altitude (857 m asl) (Fig. 2).

@@ Line 12: / Line 12: @@
 *Sowing dates were in February (07/02/2009, Date (1)March (07/03/2009, Date (2), April (07/04/2009, Date (3), July(17/07/2009, Date (4), September (17/09/2009, Date (5) and October (19/10/2009, Date (6). Dates 1–3 fell into the hot-dry season, Date 4 corresponded to the recommended main (wet) season,Date 5 was a late wet season sowing date frequently associated with cool nights during reproductive development, and Date6 was a date generally associated with chilling stress causing spikelet sterility, associated with very low air humidity (Fig. 1)
 <br>
-[[File:IC4R007-Phenomics-2015-26104586-f1a.png |center |thumb |10000px |'''''']]
+[[File:IC4R007-Phenomics-2015-26104586-f1a.png |center |thumb |10000px ]]
-[[File:IC4R007-Phenomics-2015-26104586-f1b.png |center |thumb |10000px |'''''']]
+[[File:IC4R007-Phenomics-2015-26104586-f1b.png |center |thumb |10000px |''''''Fig. 1. Seasonal dynamics of spikelet sterility and duration from sowing to flowering for four check varieties in Senegal. Means of six replications and SEM are presented.'''''']]
 <br>
 *The cold tolerant check Chomrong was not tested in Madagascar.For the remaining three checks, duration to flowering was almost constantly 23 days longer at high altitude (1497 m asl) than at mid altitude (857 m asl) (Fig. 2).
 <br>
-[[File:IC4R007-Phenomics-2015-26104586-f2.png |center |thumb |10000px |'''''']]
+[[File:IC4R007-Phenomics-2015-26104586-f2.png |center |thumb |10000px |''''''Fig. 2. Incidence of spikelet sterility (A) and duration from sowing to flowering (B)for three check varieties observed at two altitudes in Madagascar. Error bars indicate
 <br>
 *Sterility levels observed at given sowing dates or locations among check varieties are difficult to compare because different phenology causes de-synchronization of the cold sensitive booting stage (coinciding with microspore stage). The researchers thus regressed the observed sterility against the estimated mean minimal water temperature during the presumed sensitive phase for each observation (Fig. 3), excluding data potentially affected by heat induced sterility.

@@ Line 25: / Line 25: @@
 *To illustrate the diversity of observed responses, 25 selected accessions from different genetic groups and having contrasting thermal response of spikelet sterility are presented in Fig. 4. The same type of linear regression analysis was performed as for the checks in Fig. 3, but data from Senegal and Madagascar were combined in a single regression analysis (but represented with different symbols in Fig. 4)
 <br>
-[[File:IC4R007-Phenomics-2015-26104586-f4a.png |center |thumb |10000px |'''''']]
+[[File:IC4R007-Phenomics-2015-26104586-f4a.png |center |thumb |10000px ]]
-[[File:IC4R007-Phenomics-2015-26104586-f4b.png |center |thumb |10000px |'''''']]
+[[File:IC4R007-Phenomics-2015-26104586-f4b.png |center |thumb |10000px ]]
-[[File:IC4R007-Phenomics-2015-26104586-f4c.png |center |thumb |10000px |'''''']]
+[[File:IC4R007-Phenomics-2015-26104586-f4c.png |center |thumb |10000px |''''''Fig. 4. Examples of contrasting genotypic responses of fraction spikelet sterility to estimated minimum water temperature (Tw) between booting and heading stages. (A1–E1) Highly sensitive indica accessions. (A2–E2) Tolerant indica types. (A3–E3) Improved rice varieties with varying tolerance. (A4–B4) Tolerant temperate japonica types. (C4–A5)Tropical japonica types. (B5–C5) Aromatic types. D5: Aus type. E5: all observations confounded. Linear regression lines are provided with 95% confidence interval. Filled symbols, Madagascar (two altitudes and years confounded); open symbols, Senegal (6 sowing dates confounded but cases of temperature >23 ◦C removed to exclude potential incidence of heat sterility).'''''']]
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